psql — PostgreSQL interactive terminal
psql [option...] [dbname
    [username]]
psql is a terminal-based front-end to PostgreSQL. It enables you to type in queries interactively, issue them to PostgreSQL, and see the query results. Alternatively, input can be from a file or from command line arguments. In addition, psql provides a number of meta-commands and various shell-like features to facilitate writing scripts and automating a wide variety of tasks.
-a--echo-all
      Print all nonempty input lines to standard output as they are read.
      (This does not apply to lines read interactively.) This is
      equivalent to setting the variable ECHO to
      all.
      
-A--no-align
      Switches to unaligned output mode. (The default output mode is
      aligned.)  This is equivalent to
      \pset format unaligned.
      
-b--echo-errors
      Print failed SQL commands to standard error output. This is
      equivalent to setting the variable ECHO to
      errors.
      
-c command--command=command
       Specifies that psql is to execute the given
       command string, command.
       This option can be repeated and combined in any order with
       the -f option.  When either -c
       or -f is specified, psql
       does not read commands from standard input; instead it terminates
       after processing all the -c and -f
       options in sequence.
      
       command must be either
       a command string that is completely parsable by the server (i.e.,
       it contains no psql-specific features),
       or a single backslash command. Thus you cannot mix
       SQL and psql
       meta-commands within a -c option. To achieve that,
       you could use repeated -c options or pipe the string
       into psql, for example:
psql -c '\x' -c 'SELECT * FROM foo;'
or
echo '\x \\ SELECT * FROM foo;' | psql
       (\\ is the separator meta-command.)
      
       Each SQL command string passed
       to -c is sent to the server as a single request.
       Because of this, the server executes it as a single transaction even
       if the string contains multiple SQL commands,
       unless there are explicit BEGIN/COMMIT
       commands included in the string to divide it into multiple
       transactions.  (See Section 52.2.2.1
       for more details about how the server handles multi-query strings.)
       Also, psql only prints the
       result of the last SQL command in the string.
       This is different from the behavior when the same string is read from
       a file or fed to psql's standard input,
       because then psql sends
       each SQL command separately.
      
       Because of this behavior, putting more than one SQL command in a
       single -c string often has unexpected results.
       It's better to use repeated -c commands or feed
       multiple commands to psql's standard input,
       either using echo as illustrated above, or
       via a shell here-document, for example:
psql <<EOF \x SELECT * FROM foo; EOF
--csv
      Switches to CSV (Comma-Separated Values) output
      mode.  This is equivalent to \pset format csv.
      
-d dbname--dbname=dbname
       Specifies the name of the database to connect to. This is
       equivalent to specifying dbname as the first non-option
       argument on the command line.  The dbname
       can be a connection string.
       If so, connection string parameters will override any conflicting
       command line options.
      
-e--echo-queries
      Copy all SQL commands sent to the server to standard output as well.
      This is equivalent
      to setting the variable ECHO to
      queries.
      
-E--echo-hidden
      Echo the actual queries generated by \d and other backslash
      commands. You can use this to study psql's
      internal operations. This is equivalent to
      setting the variable ECHO_HIDDEN to on.
      
-f filename--file=filename
       Read commands from the
       file filename,
       rather than standard input.
       This option can be repeated and combined in any order with
       the -c option.  When either -c
       or -f is specified, psql
       does not read commands from standard input; instead it terminates
       after processing all the -c and -f
       options in sequence.
       Except for that, this option is largely equivalent to the
       meta-command \i.
      
       If filename is -
       (hyphen), then standard input is read until an EOF indication
       or \q meta-command.  This can be used to intersperse
       interactive input with input from files.  Note however that Readline
       is not used in this case (much as if -n had been
       specified).
      
      Using this option is subtly different from writing psql
      < . In general,
      both will do what you expect, but using filename-f
      enables some nice features such as error messages with line
      numbers. There is also a slight chance that using this option will
      reduce the start-up overhead. On the other hand, the variant using
      the shell's input redirection is (in theory) guaranteed to yield
      exactly the same output you would have received had you entered
      everything by hand.
      
-F separator--field-separator=separator
      Use separator as the
      field separator for unaligned output. This is equivalent to
      \pset fieldsep or \f.
      
-h hostname--host=hostnameSpecifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory for the Unix-domain socket.
-H--html
      Switches to HTML output mode.  This is
      equivalent to \pset format html or the
      \H command.
      
-l--list
      List all available databases, then exit. Other non-connection
      options are ignored. This is similar to the meta-command
      \list.
      
      When this option is used, psql will connect
      to the database postgres, unless a different database
      is named on the command line (option -d or non-option
      argument, possibly via a service entry, but not via an environment
      variable).
      
-L filename--log-file=filename
       Write all query output into file filename, in addition to the
       normal output destination.
      
-n--no-readlineDo not use Readline for line editing and do not use the command history. This can be useful to turn off tab expansion when cutting and pasting.
-o filename--output=filename
      Put all query output into file filename. This is equivalent to
      the command \o.
      
-p port--port=port
      Specifies the TCP port or the local Unix-domain
      socket file extension on which the server is listening for
      connections. Defaults to the value of the PGPORT
      environment variable or, if not set, to the port specified at
      compile time, usually 5432.
      
-P assignment--pset=assignment
      Specifies printing options, in the style of
      \pset. Note that here you
      have to separate name and value with an equal sign instead of a
      space. For example, to set the output format to LaTeX, you could write
      -P format=latex.
      
-q--quiet
      Specifies that psql should do its work
      quietly. By default, it prints welcome messages and various
      informational output. If this option is used, none of this
      happens. This is useful with the -c option.
      This is equivalent to setting the variable QUIET
      to on.
      
-R separator--record-separator=separator
      Use separator as the
      record separator for unaligned output. This is equivalent to
      \pset recordsep.
      
-s--single-stepRun in single-step mode. That means the user is prompted before each command is sent to the server, with the option to cancel execution as well. Use this to debug scripts.
-S--single-lineRuns in single-line mode where a newline terminates an SQL command, as a semicolon does.
This mode is provided for those who insist on it, but you are not necessarily encouraged to use it. In particular, if you mix SQL and meta-commands on a line the order of execution might not always be clear to the inexperienced user.
-t--tuples-only
      Turn off printing of column names and result row count footers,
      etc. This is equivalent to \t or
      \pset tuples_only.
      
-T table_options--table-attr=table_options
      Specifies options to be placed within the
      HTML table tag. See
      \pset tableattr for details.
      
-U username--username=username
      Connect to the database as the user username instead of the default.
      (You must have permission to do so, of course.)
      
-v assignment--set=assignment--variable=assignment
      Perform a variable assignment, like the \set
      meta-command. Note that you must separate name and value, if
      any, by an equal sign on the command line. To unset a variable,
      leave off the equal sign. To set a variable with an empty value,
      use the equal sign but leave off the value. These assignments are
      done during command line processing, so variables that reflect
      connection state will get overwritten later.
      
-V--versionPrint the psql version and exit.
-w--no-password
       Never issue a password prompt.  If the server requires password
       authentication and a password is not available from other sources
       such as a .pgpass file, the connection
       attempt will fail.  This option can be useful in batch jobs and
       scripts where no user is present to enter a password.
      
       Note that this option will remain set for the entire session,
       and so it affects uses of the meta-command
       \connect as well as the initial connection attempt.
      
-W--passwordForce psql to prompt for a password before connecting to a database, even if the password will not be used.
       If the server requires password authentication and a password is not
       available from other sources such as a .pgpass
       file, psql will prompt for a
       password in any case.  However, psql
       will waste a connection attempt finding out that the server wants a
       password.  In some cases it is worth typing -W to avoid
       the extra connection attempt.
      
       Note that this option will remain set for the entire session,
       and so it affects uses of the meta-command
       \connect as well as the initial connection attempt.
      
-x--expanded
      Turn on the expanded table formatting mode. This is equivalent to
      \x or \pset expanded.
      
-X--no-psqlrc
      Do not read the start-up file (neither the system-wide
      psqlrc file nor the user's
      ~/.psqlrc file).
      
-z--field-separator-zero
      Set the field separator for unaligned output to a zero byte.  This is
      equivalent to \pset fieldsep_zero.
      
-0--record-separator-zero
      Set the record separator for unaligned output to a zero byte.  This is
      useful for interfacing, for example, with xargs -0.
      This is equivalent to \pset recordsep_zero.
      
-1--single-transaction
        This option can only be used in combination with one or more
        -c and/or -f options.  It causes
        psql to issue a BEGIN command
        before the first such option and a COMMIT command after
        the last one, thereby wrapping all the commands into a single
        transaction.  This ensures that either all the commands complete
        successfully, or no changes are applied.
       
        If the commands themselves
        contain BEGIN, COMMIT,
        or ROLLBACK, this option will not have the desired
        effects.  Also, if an individual command cannot be executed inside a
        transaction block, specifying this option will cause the whole
        transaction to fail.
       
-?--help[=topic]
      Show help about psql and exit. The optional
      topic parameter (defaulting
      to options) selects which part of psql is
      explained: commands describes psql's
      backslash commands; options describes the command-line
      options that can be passed to psql;
      and variables shows help about psql configuration
      variables.
      
   psql returns 0 to the shell if it
   finished normally, 1 if a fatal error of its own occurs (e.g., out of memory,
   file not found), 2 if the connection to the server went bad
   and the session was not interactive, and 3 if an error occurred in a
   script and the variable ON_ERROR_STOP was set.
  
    psql is a regular
    PostgreSQL client application. In order
    to connect to a database you need to know the name of your target
    database, the host name and port number of the server, and what user
    name you want to connect as. psql can be
    told about those parameters via command line options, namely
    -d, -h, -p, and
    -U respectively. If an argument is found that does
    not belong to any option it will be interpreted as the database name
    (or the user name, if the database name is already given). Not all
    of these options are required; there are useful defaults. If you omit the host
    name, psql will connect via a Unix-domain socket
    to a server on the local host, or via TCP/IP to localhost on
    machines that don't have Unix-domain sockets. The default port number is
    determined at compile time.
    Since the database server uses the same default, you will not have
    to specify the port in most cases. The default user name is your
    operating-system user name, as is the default database name.
    Note that you cannot
    just connect to any database under any user name. Your database
    administrator should have informed you about your access rights.
    
    When the defaults aren't quite right, you can save yourself
    some typing by setting the environment variables
    PGDATABASE, PGHOST,
    PGPORT and/or PGUSER to appropriate
    values. (For additional environment variables, see Section 33.14.) It is also convenient to have a
    ~/.pgpass file to avoid regularly having to type in
    passwords. See Section 33.15 for more information.
    
     An alternative way to specify connection parameters is in a
     conninfo string or
     a URI, which is used instead of a database
     name. This mechanism give you very wide control over the
     connection. For example:
$psql "service=myservice sslmode=require"$psql postgresql://dbmaster:5433/mydb?sslmode=require
This way you can also use LDAP for connection parameter lookup as described in Section 33.17. See Section 33.1.2 for more information on all the available connection options.
If the connection could not be made for any reason (e.g., insufficient privileges, server is not running on the targeted host, etc.), psql will return an error and terminate.
     If both standard input and standard output are a
     terminal, then psql sets the client
     encoding to “auto”, which will detect the
     appropriate client encoding from the locale settings
     (LC_CTYPE environment variable on Unix systems).
     If this doesn't work out as expected, the client encoding can be
     overridden using the environment
     variable PGCLIENTENCODING.
    
    In normal operation, psql provides a
    prompt with the name of the database to which
    psql is currently connected, followed by
    the string =>. For example:
$ psql testdb
psql (13.21)
Type "help" for help.
testdb=>
At the prompt, the user can type in SQL commands. Ordinarily, input lines are sent to the server when a command-terminating semicolon is reached. An end of line does not terminate a command. Thus commands can be spread over several lines for clarity. If the command was sent and executed without error, the results of the command are displayed on the screen.
    If untrusted users have access to a database that has not adopted a
    secure schema usage pattern,
    begin your session by removing publicly-writable schemas
    from search_path.  One can
    add options=-csearch_path= to the connection string or
    issue SELECT pg_catalog.set_config('search_path', '',
    false) before other SQL commands.  This consideration is not
    specific to psql; it applies to every interface
    for executing arbitrary SQL commands.
    
Whenever a command is executed, psql also polls for asynchronous notification events generated by LISTEN and NOTIFY.
While C-style block comments are passed to the server for processing and removal, SQL-standard comments are removed by psql.
Anything you enter in psql that begins with an unquoted backslash is a psql meta-command that is processed by psql itself. These commands make psql more useful for administration or scripting. Meta-commands are often called slash or backslash commands.
The format of a psql command is the backslash, followed immediately by a command verb, then any arguments. The arguments are separated from the command verb and each other by any number of whitespace characters.
    To include whitespace in an argument you can quote it with
    single quotes. To include a single quote in an argument,
    write two single quotes within single-quoted text.
    Anything contained in single quotes is
    furthermore subject to C-like substitutions for
    \n (new line), \t (tab),
    \b (backspace), \r (carriage return),
    \f (form feed),
    \digits (octal), and
    \xdigits (hexadecimal).
    A backslash preceding any other character within single-quoted text
    quotes that single character, whatever it is.
    
    If an unquoted colon (:) followed by a
    psql variable name appears within an argument, it is
    replaced by the variable's value, as described in SQL Interpolation below.
    The forms :' and
    variable_name':" described there
    work as well.
    The variable_name":{? syntax allows
    testing whether a variable is defined. It is substituted by
    TRUE or FALSE.
    Escaping the colon with a backslash protects it from substitution.
    variable_name}
    Within an argument, text that is enclosed in backquotes
    (`) is taken as a command line that is passed to the
    shell.  The output of the command (with any trailing newline removed)
    replaces the backquoted text.  Within the text enclosed in backquotes,
    no special quoting or other processing occurs, except that appearances
    of : where
    variable_namevariable_name is a psql variable name
    are replaced by the variable's value.  Also, appearances of
    :' are replaced by the
    variable's value suitably quoted to become a single shell command
    argument.  (The latter form is almost always preferable, unless you are
    very sure of what is in the variable.)  Because carriage return and line
    feed characters cannot be safely quoted on all platforms, the
    variable_name':' form prints an
    error message and does not substitute the variable value when such
    characters appear in the value.
    variable_name'
    Some commands take an SQL identifier (such as a
    table name) as argument. These arguments follow the syntax rules
    of SQL: Unquoted letters are forced to
    lowercase, while double quotes (") protect letters
    from case conversion and allow incorporation of whitespace into
    the identifier.  Within double quotes, paired double quotes reduce
    to a single double quote in the resulting name.  For example,
    FOO"BAR"BAZ is interpreted as fooBARbaz,
    and "A weird"" name" becomes A weird"
    name.
    
    Parsing for arguments stops at the end of the line, or when another
    unquoted backslash is found.  An unquoted backslash
    is taken as the beginning of a new meta-command. The special
    sequence \\ (two backslashes) marks the end of
    arguments and continues parsing SQL commands, if
    any. That way SQL and
    psql commands can be freely mixed on a
    line. But in any case, the arguments of a meta-command cannot
    continue beyond the end of the line.
    
Many of the meta-commands act on the current query buffer. This is simply a buffer holding whatever SQL command text has been typed but not yet sent to the server for execution. This will include previous input lines as well as any text appearing before the meta-command on the same line.
The following meta-commands are defined:
\a
        If the current table output format is unaligned, it is switched to aligned.
        If it is not unaligned, it is set to unaligned. This command is
        kept for backwards compatibility. See \pset for a
        more general solution.
        
\c or \connect [ -reuse-previous=on|off ] [ dbname [ username ] [ host ] [ port ] | conninfo ]
        Establishes a new connection to a PostgreSQL
        server.  The connection parameters to use can be specified either
        using a positional syntax (one or more of database name, user,
        host, and port), or using a conninfo
        connection string as detailed in
        Section 33.1.1.  If no arguments are given, a
        new connection is made using the same parameters as before.
        
        Specifying any
        of dbname,
        username,
        host or
        port
        as - is equivalent to omitting that parameter.
        
        The new connection can re-use connection parameters from the previous
        connection; not only database name, user, host, and port, but other
        settings such as sslmode.  By default,
        parameters are re-used in the positional syntax, but not when
        a conninfo string is given.  Passing a
        first argument of -reuse-previous=on
        or -reuse-previous=off overrides that default.  If
        parameters are re-used, then any parameter not explicitly specified as
        a positional parameter or in the conninfo
        string is taken from the existing connection's parameters.  An
        exception is that if the host setting
        is changed from its previous value using the positional syntax,
        any hostaddr setting present in the
        existing connection's parameters is dropped.
        Also, any password used for the existing connection will be re-used
        only if the user, host, and port settings are not changed.
        When the command neither specifies nor reuses a particular parameter,
        the libpq default is used.
        
If the new connection is successfully made, the previous connection is closed. If the connection attempt fails (wrong user name, access denied, etc.), the previous connection will be kept if psql is in interactive mode. But when executing a non-interactive script, processing will immediately stop with an error. This distinction was chosen as a user convenience against typos on the one hand, and a safety mechanism that scripts are not accidentally acting on the wrong database on the other hand.
Examples:
=> \c mydb myuser host.dom 6432 => \c service=foo => \c "host=localhost port=5432 dbname=mydb connect_timeout=10 sslmode=disable" => \c -reuse-previous=on sslmode=require -- changes only sslmode => \c postgresql://tom@localhost/mydb?application_name=myapp
\C [ title ]
        Sets the title of any tables being printed as the result of a
        query or unset any such title. This command is equivalent to
        \pset title . (The name of
        this command derives from “caption”, as it was
        previously only used to set the caption in an
        HTML table.)
        title
\cd [ directory ]
         Changes the current working directory to
         directory. Without argument, changes
         to the current user's home directory.
        
          To print your current working directory, use \! pwd.
         
\conninfoOutputs information about the current database connection.
\copy { table [ ( column_list ) ] }
        from
        { 'filename' | program 'command' | stdin | pstdin }
        [ [ with ] ( option [, ...] ) ]
        [ where condition ]\copy { table [ ( column_list ) ] | ( query ) }
        to
        { 'filename' | program 'command' | stdout | pstdout }
        [ [ with ] ( option [, ...] ) ]Performs a frontend (client) copy. This is an operation that runs an SQL COPY command, but instead of the server reading or writing the specified file, psql reads or writes the file and routes the data between the server and the local file system. This means that file accessibility and privileges are those of the local user, not the server, and no SQL superuser privileges are required.
        When program is specified,
        command is
        executed by psql and the data passed from
        or to command is
        routed between the server and the client.
        Again, the execution privileges are those of
        the local user, not the server, and no SQL superuser
        privileges are required.
        
        For \copy ... from stdin, data rows are read from the same
        source that issued the command, continuing until \.
        is read or the stream reaches EOF. This option is useful
        for populating tables in-line within a SQL script file.
        For \copy ... to stdout, output is sent to the same place
        as psql command output, and
        the COPY  command status is
        not printed (since it might be confused with a data row).
        To read/write psql's standard input or
        output regardless of the current command source or count\o
        option, write from pstdin or to pstdout.
        
        The syntax of this command is similar to that of the
        SQL COPY
        command.  All options other than the data source/destination are
        as specified for COPY.
        Because of this, special parsing rules apply to the \copy
        meta-command.  Unlike most other meta-commands, the entire remainder
        of the line is always taken to be the arguments of \copy,
        and neither variable interpolation nor backquote expansion are
        performed in the arguments.
        
        Another way to obtain the same result as \copy
        ... to is to use the SQL COPY
        ... TO STDOUT command and terminate it
        with \g 
        or filename\g |.
        Unlike program\copy, this method allows the command to
        span multiple lines; also, variable interpolation and backquote
        expansion can be used.
        
        These operations are not as efficient as the SQL
        COPY command with a file or program data source or
        destination, because all data must pass through the client/server
        connection.  For large amounts of data the SQL
        command might be preferable.
        Also, because of this pass-through method, \copy
        ... from in CSV mode will erroneously
        treat a \. data value alone on a line as an
        end-of-input marker.
        
\copyrightShows the copyright and distribution terms of PostgreSQL.
\crosstabview [
            colV
            [ colH
            [ colD
            [ sortcolH
            ] ] ] ] 
        Executes the current query buffer (like \g) and
        shows the results in a crosstab grid.
        The query must return at least three columns.
        The output column identified by colV
        becomes a vertical header and the output column identified by
        colH
        becomes a horizontal header.
        colD identifies
        the output column to display within the grid.
        sortcolH identifies
        an optional sort column for the horizontal header.
        
        Each column specification can be a column number (starting at 1) or
        a column name.  The usual SQL case folding and quoting rules apply to
        column names.  If omitted,
        colV is taken as column 1
        and colH as column 2.
        colH must differ from
        colV.
        If colD is not
        specified, then there must be exactly three columns in the query
        result, and the column that is neither
        colV nor
        colH
        is taken to be colD.
        
        The vertical header, displayed as the leftmost column, contains the
        values found in column colV, in the
        same order as in the query results, but with duplicates removed.
        
        The horizontal header, displayed as the first row, contains the values
        found in column colH,
        with duplicates removed.  By default, these appear in the same order
        as in the query results.  But if the
        optional sortcolH argument is given,
        it identifies a column whose values must be integer numbers, and the
        values from colH will
        appear in the horizontal header sorted according to the
        corresponding sortcolH values.
        
        Inside the crosstab grid, for each distinct value x
        of colH and each distinct
        value y
        of colV, the cell located
        at the intersection (x,y) contains the value of
        the colD column in the query result row for which
        the value of colH
        is x and the value
        of colV
        is y.  If there is no such row, the cell is empty.  If
        there are multiple such rows, an error is reported.
        
\d[S+] [ pattern ]
        For each relation (table, view, materialized view, index, sequence,
        or foreign table)
        or composite type matching the
        pattern, show all
        columns, their types, the tablespace (if not the default) and any
        special attributes such as NOT NULL or defaults.
        Associated indexes, constraints, rules, and triggers are
        also shown.  For foreign tables, the associated foreign
        server is shown as well.
        (“Matching the pattern” is defined in
        Patterns below.)
        
        For some types of relation, \d shows additional information
        for each column: column values for sequences, indexed expressions for
        indexes, and foreign data wrapper options for foreign tables.
        
        The command form \d+ is identical, except that
        more information is displayed: any comments associated with the
        columns of the table are shown, as is the presence of OIDs in the
        table, the view definition if the relation is a view, a non-default
        replica
        identity setting.
        
        By default, only user-created objects are shown;  supply a
        pattern or the S modifier to include system
        objects.
        
        If \d is used without a
        pattern argument, it is
        equivalent to \dtvmsE which will show a list of
        all visible tables, views, materialized views, sequences and
        foreign tables.
        This is purely a convenience measure.
        
\da[S] [ pattern ]
        Lists aggregate functions, together with their
        return type and the data types they operate on. If pattern
        is specified, only aggregates whose names match the pattern are shown.
        By default, only user-created objects are shown;  supply a
        pattern or the S modifier to include system
        objects.
        
\dA[+] [ pattern ]
        Lists access methods. If pattern is specified, only access
        methods whose names match the pattern are shown. If
        + is appended to the command name, each access
        method is listed with its associated handler function and description.
        
\dAc[+]
            [access-method-pattern
              [input-type-pattern]]
          
        
        Lists operator classes
        (see Section 37.16.1).
        If access-method-pattern
        is specified, only operator classes associated with access methods whose
        names match that pattern are listed.
        If input-type-pattern
        is specified, only operator classes associated with input types whose
        names match that pattern are listed.
        If + is appended to the command name, each operator
        class is listed with its associated operator family and owner.
        
\dAf[+]
            [access-method-pattern
              [input-type-pattern]]
          
        
        Lists operator families
        (see Section 37.16.5).
        If access-method-pattern
        is specified, only operator families associated with access methods whose
        names match that pattern are listed.
        If input-type-pattern
        is specified, only operator families associated with input types whose
        names match that pattern are listed.
        If + is appended to the command name, each operator
        family is listed with its owner.
        
\dAo[+]
            [access-method-pattern
              [operator-family-pattern]]
          
        
        Lists operators associated with operator families
        (see Section 37.16.2).
        If access-method-pattern
        is specified, only members of operator families associated with access
        methods whose names match that pattern are listed.
        If operator-family-pattern
        is specified, only members of operator families whose names match that
        pattern are listed.
        If + is appended to the command name, each operator
        is listed with its sort operator family (if it is an ordering operator).
        
\dAp[+]
            [access-method-pattern
              [operator-family-pattern]]
          
        
        Lists support functions associated with operator families
        (see Section 37.16.3).
        If access-method-pattern
        is specified, only functions of operator families associated with
        access methods whose names match that pattern are listed.
        If operator-family-pattern
        is specified, only functions of operator families whose names match
        that pattern are listed.
        If + is appended to the command name, functions are
        displayed verbosely, with their actual parameter lists.
        
\db[+] [ pattern ]
        Lists tablespaces. If pattern
        is specified, only tablespaces whose names match the pattern are shown.
        If + is appended to the command name, each tablespace
        is listed with its associated options, on-disk size, permissions and
        description.
        
\dc[S+] [ pattern ]
        Lists conversions between character-set encodings.
        If pattern
        is specified, only conversions whose names match the pattern are
        listed.
        By default, only user-created objects are shown;  supply a
        pattern or the S modifier to include system
        objects.
        If + is appended to the command name, each object
        is listed with its associated description.
        
\dC[+] [ pattern ]
        Lists type casts.
        If pattern
        is specified, only casts whose source or target types match the
        pattern are listed.
        If + is appended to the command name, each object
        is listed with its associated description.
        
\dd[S] [ pattern ]
        Shows the descriptions of objects of type constraint,
        operator class, operator family,
        rule, and trigger. All
        other comments may be viewed by the respective backslash commands for
        those object types.
        
\dd displays descriptions for objects matching the
        pattern, or of visible
        objects of the appropriate type if no argument is given.  But in either
        case, only objects that have a description are listed.
        By default, only user-created objects are shown;  supply a
        pattern or the S modifier to include system
        objects.
        
Descriptions for objects can be created with the COMMENT SQL command.
\dD[S+] [ pattern ]
        Lists domains. If pattern
        is specified, only domains whose names match the pattern are shown.
        By default, only user-created objects are shown;  supply a
        pattern or the S modifier to include system
        objects.
        If + is appended to the command name, each object
        is listed with its associated permissions and description.
        
\ddp [ pattern ]
        Lists default access privilege settings.  An entry is shown for
        each role (and schema, if applicable) for which the default
        privilege settings have been changed from the built-in defaults.
        If pattern is
        specified, only entries whose role name or schema name matches
        the pattern are listed.
        
The ALTER DEFAULT PRIVILEGES command is used to set default access privileges. The meaning of the privilege display is explained in Section 5.7.
\dE[S+] [ pattern ]\di[S+] [ pattern ]\dm[S+] [ pattern ]\ds[S+] [ pattern ]\dt[S+] [ pattern ]\dv[S+] [ pattern ]
        In this group of commands, the letters E,
        i, m, s,
        t, and v
        stand for foreign table, index, materialized view,
        sequence, table, and view,
        respectively.
        You can specify any or all of
        these letters, in any order, to obtain a listing of objects
        of these types.  For example, \dti lists
        tables and indexes.  If + is
        appended to the command name, each object is listed with its
        persistence status (permanent, temporary, or unlogged),
        physical size on disk, and associated description if any.
        If pattern is
        specified, only objects whose names match the pattern are listed.
        By default, only user-created objects are shown; supply a
        pattern or the S modifier to include system
        objects.
        
\des[+] [ pattern ]
        Lists foreign servers (mnemonic: “external
        servers”).
        If pattern is
        specified, only those servers whose name matches the pattern
        are listed.  If the form \des+ is used, a
        full description of each server is shown, including the
        server's access privileges, type, version, options, and description.
        
\det[+] [ pattern ]
        Lists foreign tables (mnemonic: “external tables”).
        If pattern is
        specified, only entries whose table name or schema name matches
        the pattern are listed.  If the form \det+
        is used, generic options and the foreign table description
        are also displayed.
        
\deu[+] [ pattern ]
        Lists user mappings (mnemonic: “external
        users”).
        If pattern is
        specified, only those mappings whose user names match the
        pattern are listed.  If the form \deu+ is
        used, additional information about each mapping is shown.
        
        \deu+ might also display the user name and
        password of the remote user, so care should be taken not to
        disclose them.
        
\dew[+] [ pattern ]
        Lists foreign-data wrappers (mnemonic: “external
        wrappers”).
        If pattern is
        specified, only those foreign-data wrappers whose name matches
        the pattern are listed.  If the form \dew+
        is used, the access privileges, options, and description of the
        foreign-data wrapper are also shown.
        
\df[anptwS+] [ pattern ]
        Lists functions, together with their result data types, argument data
        types, and function types, which are classified as “agg”
        (aggregate), “normal”, “procedure”, “trigger”, or “window”.
        To display only functions
        of specific type(s), add the corresponding letters a,
        n, p, t, or w to the command.
        If pattern is specified, only
        functions whose names match the pattern are shown.
        By default, only user-created
        objects are shown; supply a pattern or the S
        modifier to include system objects.
        If the form \df+ is used, additional information
        about each function is shown, including volatility,
        parallel safety, owner, security classification, access privileges,
        language, source code and description.
        
        To look up functions taking arguments or returning values of a specific
        data type, use your pager's search capability to scroll through the
        \df output.
        
\dF[+] [ pattern ]
         Lists text search configurations.
         If pattern is specified,
         only configurations whose names match the pattern are shown.
         If the form \dF+ is used, a full description of
         each configuration is shown, including the underlying text search
         parser and the dictionary list for each parser token type.
        
\dFd[+] [ pattern ]
         Lists text search dictionaries.
         If pattern is specified,
         only dictionaries whose names match the pattern are shown.
         If the form \dFd+ is used, additional information
         is shown about each selected dictionary, including the underlying
         text search template and the option values.
        
\dFp[+] [ pattern ]
         Lists text search parsers.
         If pattern is specified,
         only parsers whose names match the pattern are shown.
         If the form \dFp+ is used, a full description of
         each parser is shown, including the underlying functions and the
         list of recognized token types.
        
\dFt[+] [ pattern ]
         Lists text search templates.
         If pattern is specified,
         only templates whose names match the pattern are shown.
         If the form \dFt+ is used, additional information
         is shown about each template, including the underlying function names.
        
\dg[S+] [ pattern ]
        Lists database roles.
        (Since the concepts of “users” and “groups” have been
        unified into “roles”, this command is now equivalent to
        \du.)
        By default, only user-created roles are shown; supply the
        S modifier to include system roles.
        If pattern is specified,
        only those roles whose names match the pattern are listed.
        If the form \dg+ is used, additional information
        is shown about each role; currently this adds the comment for each
        role.
        
\dl
        This is an alias for \lo_list, which shows a
        list of large objects.
        
\dL[S+] [ pattern ]
        Lists procedural languages. If pattern
        is specified, only languages whose names match the pattern are listed.
        By default, only user-created languages
        are shown; supply the S modifier to include system
        objects. If + is appended to the command name, each
        language is listed with its call handler, validator, access privileges,
        and whether it is a system object.
        
\dn[S+] [ pattern ]
        Lists schemas (namespaces). If pattern
        is specified, only schemas whose names match the pattern are listed.
        By default, only user-created objects are shown; supply a
        pattern or the S modifier to include system objects.
        If + is appended to the command name, each object
        is listed with its associated permissions and description, if any.
        
\do[S+] [ pattern ]
        Lists operators with their operand and result types.
        If pattern is
        specified, only operators whose names match the pattern are listed.
        By default, only user-created objects are shown; supply a
        pattern or the S modifier to include system
        objects.
        If + is appended to the command name,
        additional information about each operator is shown, currently just
        the name of the underlying function.
        
\dO[S+] [ pattern ]
        Lists collations.
        If pattern is
        specified, only collations whose names match the pattern are
        listed.  By default, only user-created objects are shown;
        supply a pattern or the S modifier to
        include system objects.  If + is appended
        to the command name, each collation is listed with its associated
        description, if any.
        Note that only collations usable with the current database's encoding
        are shown, so the results may vary in different databases of the
        same installation.
        
\dp [ pattern ]
        Lists tables, views and sequences with their
        associated access privileges.
        If pattern is
        specified, only tables, views and sequences whose names match the
        pattern are listed.
        
The GRANT and REVOKE commands are used to set access privileges. The meaning of the privilege display is explained in Section 5.7.
\dP[itn+] [ pattern ]
        Lists partitioned relations.
        If pattern
        is specified, only entries whose name matches the pattern are listed.
        The modifiers t (tables) and i
        (indexes) can be appended to the command, filtering the kind of
        relations to list.  By default, partitioned tables and indexes are
        listed.
        
        If the modifier n (“nested”) is used,
        or a pattern is specified, then non-root partitioned relations are
        included, and a column is shown displaying the parent of each
        partitioned relation.
        
        If + is appended to the command name, the sum of the
        sizes of each relation's partitions is also displayed, along with the
        relation's description.
        If n is combined with +, two
        sizes are shown: one including the total size of directly-attached
        leaf partitions, and another showing the total size of all partitions,
        including indirectly attached sub-partitions.
        
\drds [ role-pattern [ database-pattern ] ]
        Lists defined configuration settings.  These settings can be
        role-specific, database-specific, or both.
        role-pattern and
        database-pattern are used to select
        specific roles and databases to list, respectively.  If omitted, or if
        * is specified, all settings are listed, including those
        not role-specific or database-specific, respectively.
        
The ALTER ROLE and ALTER DATABASE commands are used to define per-role and per-database configuration settings.
\dRp[+] [ pattern ]
        Lists replication publications.
        If pattern is
        specified, only those publications whose names match the pattern are
        listed.
        If + is appended to the command name, the tables
        associated with each publication are shown as well.
        
\dRs[+] [ pattern ]
        Lists replication subscriptions.
        If pattern is
        specified, only those subscriptions whose names match the pattern are
        listed.
        If + is appended to the command name, additional
        properties of the subscriptions are shown.
        
\dT[S+] [ pattern ]
        Lists data types.
        If pattern is
        specified, only types whose names match the pattern are listed.
        If + is appended to the command name, each type is
        listed with its internal name and size, its allowed values
        if it is an enum type, and its associated permissions.
        By default, only user-created objects are shown;  supply a
        pattern or the S modifier to include system
        objects.
        
\du[S+] [ pattern ]
        Lists database roles.
        (Since the concepts of “users” and “groups” have been
        unified into “roles”, this command is now equivalent to
        \dg.)
        By default, only user-created roles are shown; supply the
        S modifier to include system roles.
        If pattern is specified,
        only those roles whose names match the pattern are listed.
        If the form \du+ is used, additional information
        is shown about each role; currently this adds the comment for each
        role.
        
\dx[+] [ pattern ]
        Lists installed extensions.
        If pattern
        is specified, only those extensions whose names match the pattern
        are listed.
        If the form \dx+ is used, all the objects belonging
        to each matching extension are listed.
        
\dy[+] [ pattern ]
        Lists event triggers.
        If pattern
        is specified, only those event triggers whose names match the pattern
        are listed.
        If + is appended to the command name, each object
        is listed with its associated description.
        
\e or \edit  [ filename ] [ line_number ] 
        If filename is
        specified, the file is edited; after the editor exits, the file's
        content is copied into the current query buffer. If no filename is given, the current query
        buffer is copied to a temporary file which is then edited in the same
        fashion.  Or, if the current query buffer is empty, the most recently
        executed query is copied to a temporary file and edited in the same
        fashion.
        
        The new contents of the query buffer are then re-parsed according to
        the normal rules of psql, treating the
        whole buffer as a single line.  Any complete queries are immediately
        executed; that is, if the query buffer contains or ends with a
        semicolon, everything up to that point is executed and removed from
        the query buffer.  Whatever remains in the query buffer is
        redisplayed.  Type semicolon or \g to send it,
        or \r to cancel it by clearing the query buffer.
        
        Treating the buffer as a single line primarily affects meta-commands:
        whatever is in the buffer after a meta-command will be taken as
        argument(s) to the meta-command, even if it spans multiple lines.
        (Thus you cannot make meta-command-using scripts this way.
        Use \i for that.)
        
If a line number is specified, psql will position the cursor on the specified line of the file or query buffer. Note that if a single all-digits argument is given, psql assumes it is a line number, not a file name.
See Environment, below, for how to configure and customize your editor.
\echo text [ ... ]Prints the evaluated arguments to standard output, separated by spaces and followed by a newline. This can be useful to intersperse information in the output of scripts. For example:
=> \echo `date`
Tue Oct 26 21:40:57 CEST 1999
        If the first argument is an unquoted -n the trailing
        newline is not written (nor is the first argument).
        
        If you use the \o command to redirect your
        query output you might wish to use \qecho
        instead of this command.  See also \warn.
        
\ef [ function_description [  line_number ] ] 
         This command fetches and edits the definition of the named function or procedure,
         in the form of a CREATE OR REPLACE FUNCTION or
         CREATE OR REPLACE PROCEDURE command.
         Editing is done in the same way as for \edit.
         After the editor exits, the updated command is executed immediately
         if you added a semicolon to it.  Otherwise it is redisplayed;
         type semicolon or \g to send it, or \r
         to cancel.
        
         The target function can be specified by name alone, or by name
         and arguments, for example foo(integer, text).
         The argument types must be given if there is more
         than one function of the same name.
        
         If no function is specified, a blank CREATE FUNCTION
         template is presented for editing.
        
If a line number is specified, psql will position the cursor on the specified line of the function body. (Note that the function body typically does not begin on the first line of the file.)
        Unlike most other meta-commands, the entire remainder of the line is
        always taken to be the argument(s) of \ef, and neither
        variable interpolation nor backquote expansion are performed in the
        arguments.
        
See Environment, below, for how to configure and customize your editor.
\encoding [ encoding ]Sets the client character set encoding. Without an argument, this command shows the current encoding.
\errverbose
        Repeats the most recent server error message at maximum
        verbosity, as though VERBOSITY were set
        to verbose and SHOW_CONTEXT were
        set to always.
        
\ev [ view_name [  line_number ] ] 
         This command fetches and edits the definition of the named view,
         in the form of a CREATE OR REPLACE VIEW command.
         Editing is done in the same way as for \edit.
         After the editor exits, the updated command is executed immediately
         if you added a semicolon to it.  Otherwise it is redisplayed;
         type semicolon or \g to send it, or \r
         to cancel.
        
         If no view is specified, a blank CREATE VIEW
         template is presented for editing.
        
If a line number is specified, psql will position the cursor on the specified line of the view definition.
        Unlike most other meta-commands, the entire remainder of the line is
        always taken to be the argument(s) of \ev, and neither
        variable interpolation nor backquote expansion are performed in the
        arguments.
        
\f [ string ]
        Sets the field separator for unaligned query output. The default
        is the vertical bar (|). It is equivalent to
        \pset fieldsep.
        
\g [ (option=value [...]) ] [ filename ]\g [ (option=value [...]) ] [ |command ]Sends the current query buffer to the server for execution.
        If parentheses appear after \g, they surround a
        space-separated list
        of option=value
        formatting-option clauses, which are interpreted in the same way
        as \pset
        option
        value commands, but take
        effect only for the duration of this query.  In this list, spaces are
        not allowed around = signs, but are required
        between option clauses.
        If =value
        is omitted, the
        named option is changed
        in the same way as for
        \pset option
        with no explicit value.
        
        If a filename
        or |command
        argument is given, the query's output is written to the named
        file or piped to the given shell command, instead of displaying it as
        usual.  The file or command is written to only if the query
        successfully returns zero or more tuples, not if the query fails or
        is a non-data-returning SQL command.
        
        If the current query buffer is empty, the most recently sent query is
        re-executed instead.  Except for that behavior, \g
        without any arguments is essentially equivalent to a semicolon.
        With arguments, \g provides
        a “one-shot” alternative to the \o
        command, and additionally allows one-shot adjustments of the
        output formatting options normally set by \pset.
        
        When the last argument begins with |, the entire
        remainder of the line is taken to be
        the command to execute,
        and neither variable interpolation nor backquote expansion are
        performed in it.  The rest of the line is simply passed literally to
        the shell.
        
\gdescShows the description (that is, the column names and data types) of the result of the current query buffer. The query is not actually executed; however, if it contains some type of syntax error, that error will be reported in the normal way.
If the current query buffer is empty, the most recently sent query is described instead.
\gexec
         Sends the current query buffer to the server, then treats
         each column of each row of the query's output (if any) as a SQL
         statement to be executed.  For example, to create an index on each
         column of my_table:
=>SELECT format('create index on my_table(%I)', attname)->FROM pg_attribute->WHERE attrelid = 'my_table'::regclass AND attnum > 0->ORDER BY attnum->\gexecCREATE INDEX CREATE INDEX CREATE INDEX CREATE INDEX
         The generated queries are executed in the order in which the rows
         are returned, and left-to-right within each row if there is more
         than one column.  NULL fields are ignored.  The generated queries
         are sent literally to the server for processing, so they cannot be
         psql meta-commands nor contain psql
         variable references.  If any individual query fails, execution of
         the remaining queries continues
         unless ON_ERROR_STOP is set.  Execution of each
         query is subject to ECHO processing.
         (Setting ECHO to all
         or queries is often advisable when
         using \gexec.)  Query logging, single-step mode,
         timing, and other query execution features apply to each generated
         query as well.
        
If the current query buffer is empty, the most recently sent query is re-executed instead.
\gset [ prefix ]Sends the current query buffer to the server and stores the query's output into psql variables (see Variables below). The query to be executed must return exactly one row. Each column of the row is stored into a separate variable, named the same as the column. For example:
=>SELECT 'hello' AS var1, 10 AS var2->\gset=>\echo :var1 :var2hello 10
         If you specify a prefix,
         that string is prepended to the query's column names to create the
         variable names to use:
=>SELECT 'hello' AS var1, 10 AS var2->\gset result_=>\echo :result_var1 :result_var2hello 10
If a column result is NULL, the corresponding variable is unset rather than being set.
If the query fails or does not return one row, no variables are changed.
If the current query buffer is empty, the most recently sent query is re-executed instead.
\gx [ (option=value [...]) ] [ filename ]\gx [ (option=value [...]) ] [ |command ]
        \gx is equivalent to \g, except
        that it forces expanded output mode for this query, as
        if expanded=on were included in the list of
        \pset options.  See also \x.
        
\h or \help [ command ]
        Gives syntax help on the specified SQL
        command. If command
        is not specified, then psql will list
        all the commands for which syntax help is available. If
        command is an
        asterisk (*), then syntax help on all
        SQL commands is shown.
        
        Unlike most other meta-commands, the entire remainder of the line is
        always taken to be the argument(s) of \help, and neither
        variable interpolation nor backquote expansion are performed in the
        arguments.
        
        To simplify typing, commands that consists of several words do
        not have to be quoted. Thus it is fine to type \help
        alter table.
        
\H or \html
        Turns on HTML query output format. If the
        HTML format is already on, it is switched
        back to the default aligned text format. This command is for
        compatibility and convenience, but see \pset
        about setting other output options.
        
\i or \include filename
        Reads input from the file filename and executes it as
        though it had been typed on the keyboard.
        
        If filename is -
        (hyphen), then standard input is read until an EOF indication
        or \q meta-command.  This can be used to intersperse
        interactive input with input from files.  Note that Readline behavior
        will be used only if it is active at the outermost level.
        
        If you want to see the lines on the screen as they are read you
        must set the variable ECHO to
        all.
        
\if expression\elif expression\else\endif
        This group of commands implements nestable conditional blocks.
        A conditional block must begin with an \if and end
        with an \endif.  In between there may be any number
        of \elif clauses, which may optionally be followed
        by a single \else clause.  Ordinary queries and
        other types of backslash commands may (and usually do) appear between
        the commands forming a conditional block.
        
        The \if and \elif commands read
        their argument(s) and evaluate them as a boolean expression.  If the
        expression yields true then processing continues
        normally; otherwise, lines are skipped until a
        matching \elif, \else,
        or \endif is reached.  Once
        an \if or \elif test has
        succeeded, the arguments of later \elif commands in
        the same block are not evaluated but are treated as false.  Lines
        following an \else are processed only if no earlier
        matching \if or \elif succeeded.
        
        The expression argument
        of an \if or \elif command
        is subject to variable interpolation and backquote expansion, just
        like any other backslash command argument.  After that it is evaluated
        like the value of an on/off option variable.  So a valid value
        is any unambiguous case-insensitive match for one of:
        true, false, 1,
        0, on, off,
        yes, no.  For example,
        t, T, and tR
        will all be considered to be true.
        
Expressions that do not properly evaluate to true or false will generate a warning and be treated as false.
        Lines being skipped are parsed normally to identify queries and
        backslash commands, but queries are not sent to the server, and
        backslash commands other than conditionals
        (\if, \elif,
        \else, \endif) are
        ignored.  Conditional commands are checked only for valid nesting.
        Variable references in skipped lines are not expanded, and backquote
        expansion is not performed either.
        
        All the backslash commands of a given conditional block must appear in
        the same source file. If EOF is reached on the main input file or an
        \include-ed file before all local
        \if-blocks have been closed,
        then psql will raise an error.
        
Here is an example:
-- check for the existence of two separate records in the database and store
-- the results in separate psql variables
SELECT
    EXISTS(SELECT 1 FROM customer WHERE customer_id = 123) as is_customer,
    EXISTS(SELECT 1 FROM employee WHERE employee_id = 456) as is_employee
\gset
\if :is_customer
    SELECT * FROM customer WHERE customer_id = 123;
\elif :is_employee
    \echo 'is not a customer but is an employee'
    SELECT * FROM employee WHERE employee_id = 456;
\else
    \if yes
        \echo 'not a customer or employee'
    \else
        \echo 'this will never print'
    \endif
\endif
\ir or \include_relative filename
        The \ir command is similar to \i, but resolves
        relative file names differently.  When executing in interactive mode,
        the two commands behave identically.  However, when invoked from a
        script, \ir interprets file names relative to the
        directory in which the script is located, rather than the current
        working directory.
        
\l[+] or \list[+] [ pattern ]
        List the databases in the server and show their names, owners,
        character set encodings, and access privileges.
        If pattern is specified,
        only databases whose names match the pattern are listed.
        If + is appended to the command name, database
        sizes, default tablespaces, and descriptions are also displayed.
        (Size information is only available for databases that the current
        user can connect to.)
        
\lo_export loid filename
        Reads the large object with OID loid from the database and
        writes it to filename. Note that this is
        subtly different from the server function
        lo_export, which acts with the permissions
        of the user that the database server runs as and on the server's
        file system.
        
        Use \lo_list to find out the large object's
        OID.
        
\lo_import filename [ comment ]Stores the file into a PostgreSQL large object. Optionally, it associates the given comment with the object. Example:
foo=> \lo_import '/home/peter/pictures/photo.xcf' 'a picture of me'
lo_import 152801
        The response indicates that the large object received object
        ID 152801, which can be used to access the newly-created large
        object in the future. For the sake of readability, it is
        recommended to always associate a human-readable comment with
        every object. Both OIDs and comments can be viewed with the
        \lo_list command.
        
        Note that this command is subtly different from the server-side
        lo_import because it acts as the local user
        on the local file system, rather than the server's user and file
        system.
        
\lo_listShows a list of all PostgreSQL large objects currently stored in the database, along with any comments provided for them.
\lo_unlink loid
        Deletes the large object with OID
        loid from the
        database.
        
        Use \lo_list to find out the large object's
        OID.
        
\o or \out [ filename ]\o or \out [ |command ]
        Arranges to save future query results to the file filename or pipe future results
        to the shell command command. If no argument is
        specified, the query output is reset to the standard output.
        
        If the argument begins with |, then the entire remainder
        of the line is taken to be
        the command to execute,
        and neither variable interpolation nor backquote expansion are
        performed in it.  The rest of the line is simply passed literally to
        the shell.
        
        “Query results” includes all tables, command
        responses, and notices obtained from the database server, as
        well as output of various backslash commands that query the
        database (such as \d); but not error
        messages.
        
        To intersperse text output in between query results, use
        \qecho.
        
\p or \printPrint the current query buffer to the standard output. If the current query buffer is empty, the most recently executed query is printed instead.
\password [ username ]
        Changes the password of the specified user (by default, the current
        user).  This command prompts for the new password, encrypts it, and
        sends it to the server as an ALTER ROLE command.  This
        makes sure that the new password does not appear in cleartext in the
        command history, the server log, or elsewhere.
        
\prompt [ text ] name
         Prompts the user to supply text, which is assigned to the variable
         name.
         An optional prompt string, text, can be specified.  (For multiword
         prompts, surround the text with single quotes.)
        
         By default, \prompt uses the terminal for input and
         output.  However, if the -f command line switch was
         used, \prompt uses standard input and standard output.
        
\pset [ option [ value ] ]
        This command sets options affecting the output of query result tables.
        option
        indicates which option is to be set. The semantics of
        value vary depending
        on the selected option.  For some options, omitting value causes the option to be toggled
        or unset, as described under the particular option.  If no such
        behavior is mentioned, then omitting
        value just results in
        the current setting being displayed.
        
        \pset without any arguments displays the current status
        of all printing options.
        
Adjustable printing options are:
border
          The value must be a
          number. In general, the higher
          the number the more borders and lines the tables will have,
          but details depend on the particular format.
          In HTML format, this will translate directly
          into the border=... attribute.
          In most other formats only values 0 (no border), 1 (internal
          dividing lines), and 2 (table frame) make sense, and values above 2
          will be treated the same as border = 2.
          The latex and latex-longtable
          formats additionally allow a value of 3 to add dividing lines
          between data rows.
          
columns
          Sets the target width for the wrapped format, and also
          the width limit for determining whether output is wide enough to
          require the pager or switch to the vertical display in expanded auto
          mode.
          Zero (the default) causes the target width to be controlled by the
          environment variable COLUMNS, or the detected screen width
          if COLUMNS is not set.
          In addition, if columns is zero then the
          wrapped format only affects screen output.
          If columns is nonzero then file and pipe output is
          wrapped to that width as well.
          
csv_fieldsepSpecifies the field separator to be used in CSV output format. If the separator character appears in a field's value, that field is output within double quotes, following standard CSV rules. The default is a comma.
expanded (or x)
          If value is specified it
          must be either on or off, which
          will enable or disable expanded mode, or auto.
          If value is omitted the
          command toggles between the on and off settings.  When expanded mode
          is enabled, query results are displayed in two columns, with the
          column name on the left and the data on the right. This mode is
          useful if the data wouldn't fit on the screen in the
          normal “horizontal” mode.  In the auto setting, the
          expanded mode is used whenever the query output has more than one
          column and is wider than the screen; otherwise, the regular mode is
          used.  The auto setting is only
          effective in the aligned and wrapped formats.  In other formats, it
          always behaves as if the expanded mode is off.
          
fieldsep
          Specifies the field separator to be used in unaligned output
          format. That way one can create, for example, tab-separated
          output, which other programs might prefer. To
          set a tab as field separator, type \pset fieldsep
          '\t'. The default field separator is
          '|' (a vertical bar).
          
fieldsep_zeroSets the field separator to use in unaligned output format to a zero byte.
footer
          If value is specified
          it must be either on or off
          which will enable or disable display of the table footer
          (the ( count).
          If n rows)value is omitted the
          command toggles footer display on or off.
          
format
          Sets the output format to one of aligned,
          asciidoc,
          csv,
          html,
          latex,
          latex-longtable, troff-ms,
          unaligned, or wrapped.
          Unique abbreviations are allowed.
          
aligned format is the standard,
          human-readable, nicely formatted text output; this is the default.
          
unaligned format writes all columns of a row on one
          line, separated by the currently active field separator. This
          is useful for creating output that might be intended to be read
          in by other programs, for example, tab-separated or comma-separated
          format.  However, the field separator character is not treated
          specially if it appears in a column's value;
          so CSV format may be better suited for such
          purposes.
          
csv format
          
          writes column values separated by commas, applying the quoting
          rules described in
          RFC 4180.
          This output is compatible with the CSV format of the server's
          COPY command.
          A header line with column names is generated unless
          the tuples_only parameter is
          on. Titles and footers are not printed.
          Each row is terminated by the system-dependent end-of-line character,
          which is typically a single newline (\n) for
          Unix-like systems or a carriage return and newline sequence
          (\r\n) for Microsoft Windows.
          Field separator characters other than comma can be selected with
          \pset csv_fieldsep.
          
wrapped format is like aligned but wraps
          wide data values across lines to make the output fit in the target
          column width.  The target width is determined as described under
          the columns option.  Note that psql will
          not attempt to wrap column header titles; therefore,
          wrapped format behaves the same as aligned
          if the total width needed for column headers exceeds the target.
          
          The asciidoc, html,
          latex, latex-longtable, and
          troff-ms formats put out tables that are intended
          to be included in documents using the respective mark-up
          language. They are not complete documents! This might not be
          necessary in HTML, but in
          LaTeX you must have a complete
          document wrapper.
          The latex format
          uses LaTeX's tabular
          environment.
          The latex-longtable format
          requires the LaTeX
          longtable and booktabs packages.
          
linestyle
          Sets the border line drawing style to one
          of ascii, old-ascii,
          or unicode.
          Unique abbreviations are allowed.  (That would mean one
          letter is enough.)
          The default setting is ascii.
          This option only affects the aligned and
          wrapped output formats.
          
ascii style uses plain ASCII
          characters.  Newlines in data are shown using
          a + symbol in the right-hand margin.
          When the wrapped format wraps data from
          one line to the next without a newline character, a dot
          (.) is shown in the right-hand margin of the first line,
          and again in the left-hand margin of the following line.
          
old-ascii style uses plain ASCII
          characters, using the formatting style used
          in PostgreSQL 8.4 and earlier.
          Newlines in data are shown using a :
          symbol in place of the left-hand column separator.
          When the data is wrapped from one line
          to the next without a newline character, a ;
          symbol is used in place of the left-hand column separator.
          
unicode style uses Unicode box-drawing characters.
          Newlines in data are shown using a carriage return symbol
          in the right-hand margin.  When the data is wrapped from one line
          to the next without a newline character, an ellipsis symbol
          is shown in the right-hand margin of the first line, and
          again in the left-hand margin of the following line.
          
          When the border setting is greater than zero,
          the linestyle option also determines the
          characters with which the border lines are drawn.
          Plain ASCII characters work everywhere, but
          Unicode characters look nicer on displays that recognize them.
          
null
          Sets the string to be printed in place of a null value.
          The default is to print nothing, which can easily be mistaken for
          an empty string. For example, one might prefer \pset null
          '(null)'.
          
numericlocale
          If value is specified
          it must be either on or off
          which will enable or disable display of a locale-specific character
          to separate groups of digits to the left of the decimal marker.
          If value is omitted the
          command toggles between regular and locale-specific numeric output.
          
pager
          Controls use of a pager program for query and psql
          help output.  If the environment variable PSQL_PAGER
          or PAGER is set, the output is piped to the
          specified program.  Otherwise a platform-dependent default program
          (such as more) is used.
          
          When the pager option is off, the pager
          program is not used. When the pager option is
          on, the pager is used when appropriate, i.e., when the
          output is to a terminal and will not fit on the screen.
          The pager option can also be set to always,
          which causes the pager to be used for all terminal output regardless
          of whether it fits on the screen.  \pset pager
          without a value
          toggles pager use on and off.
          
pager_min_lines
          If pager_min_lines is set to a number greater than the
          page height, the pager program will not be called unless there are
          at least this many lines of output to show. The default setting
          is 0.
          
recordsepSpecifies the record (line) separator to use in unaligned output format. The default is a newline character.
recordsep_zeroSets the record separator to use in unaligned output format to a zero byte.
tableattr (or T)
          In HTML format, this specifies attributes
          to be placed inside the table tag.  This
          could for example be cellpadding or
          bgcolor. Note that you probably don't want
          to specify border here, as that is already
          taken care of by \pset border.
          If no
          value is given,
          the table attributes are unset.
          
          In latex-longtable format, this controls
          the proportional width of each column containing a left-aligned
          data type.  It is specified as a whitespace-separated list of values,
          e.g., '0.2 0.2 0.6'.  Unspecified output columns
          use the last specified value.
          
title (or C)
          Sets the table title for any subsequently printed tables. This
          can be used to give your output descriptive tags. If no
          value is given,
          the title is unset.
          
tuples_only (or t)
          If value is specified
          it must be either on or off
          which will enable or disable tuples-only mode.
          If value is omitted the
          command toggles between regular and tuples-only output.
          Regular output includes extra information such
          as column headers, titles, and various footers. In tuples-only
          mode, only actual table data is shown.
          
unicode_border_linestyle
          Sets the border drawing style for the unicode
          line style to one of single
          or double.
          
unicode_column_linestyle
          Sets the column drawing style for the unicode
          line style to one of single
          or double.
          
unicode_header_linestyle
          Sets the header drawing style for the unicode
          line style to one of single
          or double.
          
Illustrations of how these different formats look can be seen in Examples, below.
        There are various shortcut commands for \pset. See
        \a, \C, \f,
        \H, \t, \T,
        and \x.
        
\q or \quitQuits the psql program. In a script file, only execution of that script is terminated.
\qecho text [ ... ] 
        This command is identical to \echo except
        that the output will be written to the query output channel, as
        set by \o.
        
\r or \resetResets (clears) the query buffer.
\s [ filename ]
        Print psql's command line history
        to filename.
        If filename is omitted,
        the history is written to the standard output (using the pager if
        appropriate).  This command is not available
        if psql was built
        without Readline support.
        
\set [ name [ value [ ... ] ] ]
        Sets the psql variable name to value, or if more than one value
        is given, to the concatenation of all of them. If only one
        argument is given, the variable is set to an empty-string value. To
        unset a variable, use the \unset command.
        
\set without any arguments displays the names and values
        of all currently-set psql variables.
        
Valid variable names can contain letters, digits, and underscores. See Variables below for details. Variable names are case-sensitive.
Certain variables are special, in that they control psql's behavior or are automatically set to reflect connection state. These variables are documented in Variables, below.
This command is unrelated to the SQL command SET.
\setenv name [ value ]
        Sets the environment variable name to value, or if the
        value is
        not supplied, unsets the environment variable. Example:
testdb=>\setenv PAGER lesstestdb=>\setenv LESS -imx4F
\sf[+] function_description 
         This command fetches and shows the definition of the named function or procedure,
         in the form of a CREATE OR REPLACE FUNCTION or
         CREATE OR REPLACE PROCEDURE command.
         The definition is printed to the current query output channel,
         as set by \o.
        
         The target function can be specified by name alone, or by name
         and arguments, for example foo(integer, text).
         The argument types must be given if there is more
         than one function of the same name.
        
         If + is appended to the command name, then the
         output lines are numbered, with the first line of the function body
         being line 1.
        
        Unlike most other meta-commands, the entire remainder of the line is
        always taken to be the argument(s) of \sf, and neither
        variable interpolation nor backquote expansion are performed in the
        arguments.
        
\sv[+] view_name 
          This command fetches and shows the definition of the named view,
          in the form of a CREATE OR REPLACE VIEW command.
          The definition is printed to the current query output channel,
          as set by \o.
         
          If + is appended to the command name, then the
          output lines are numbered from 1.
         
        Unlike most other meta-commands, the entire remainder of the line is
        always taken to be the argument(s) of \sv, and neither
        variable interpolation nor backquote expansion are performed in the
        arguments.
        
\t
        Toggles the display of output column name headings and row count
        footer. This command is equivalent to \pset
        tuples_only and is provided for convenience.
        
\T table_options
        Specifies attributes to be placed within the
        table tag in HTML
        output format. This command is equivalent to \pset
        tableattr .
        table_options
\timing [ on | off ]With a parameter, turns displaying of how long each SQL statement takes on or off. Without a parameter, toggles the display between on and off. The display is in milliseconds; intervals longer than 1 second are also shown in minutes:seconds format, with hours and days fields added if needed.
\unset name
        Unsets (deletes) the psql variable name.
        
        Most variables that control psql's behavior
        cannot be unset; instead, an \unset command is interpreted
        as setting them to their default values.
        See Variables below.
        
\w or \write filename\w or \write |command
        Writes the current query buffer to the file filename or pipes it to the shell
        command command.
        If the current query buffer is empty, the most recently executed query
        is written instead.
        
        If the argument begins with |, then the entire remainder
        of the line is taken to be
        the command to execute,
        and neither variable interpolation nor backquote expansion are
        performed in it.  The rest of the line is simply passed literally to
        the shell.
        
\warn text [ ... ]
        This command is identical to \echo except
        that the output will be written to psql's
        standard error channel, rather than standard output.
        
\watch [ seconds ]
        Repeatedly execute the current query buffer (as \g does)
        until interrupted or the query fails.  Wait the specified number of
        seconds (default 2) between executions.  Each query result is
        displayed with a header that includes the \pset title
        string (if any), the time as of query start, and the delay interval.
        
If the current query buffer is empty, the most recently sent query is re-executed instead.
\x [ on | off | auto ]
        Sets or toggles expanded table formatting mode. As such it is equivalent to
        \pset expanded.
       
\z [ pattern ]
        Lists tables, views and sequences with their
        associated access privileges.
        If a pattern is
        specified, only tables, views and sequences whose names match the
        pattern are listed.
        
        This is an alias for \dp (“display
        privileges”).
        
\! [ command ]
        With no argument, escapes to a sub-shell; psql
        resumes when the sub-shell exits.  With an argument, executes the
        shell command command.
        
        Unlike most other meta-commands, the entire remainder of the line is
        always taken to be the argument(s) of \!, and neither
        variable interpolation nor backquote expansion are performed in the
        arguments.  The rest of the line is simply passed literally to the
        shell.
        
\? [ topic ]
        Shows help information. The optional
        topic parameter
        (defaulting to commands) selects which part of psql is
        explained: commands describes psql's
        backslash commands; options describes the command-line
        options that can be passed to psql;
        and variables shows help about psql configuration
        variables.
        
\;Backslash-semicolon is not a meta-command in the same way as the preceding commands; rather, it simply causes a semicolon to be added to the query buffer without any further processing.
Normally, psql will dispatch a SQL command to the server as soon as it reaches the command-ending semicolon, even if more input remains on the current line. Thus for example entering
select 1; select 2; select 3;
        will result in the three SQL commands being individually sent to
        the server, with each one's results being displayed before
        continuing to the next command.  However, a semicolon entered
        as \; will not trigger command processing, so that the
        command before it and the one after are effectively combined and
        sent to the server in one request.  So for example
select 1\; select 2\; select 3;
        results in sending the three SQL commands to the server in a single
        request, when the non-backslashed semicolon is reached.
        The server executes such a request as a single transaction,
        unless there are explicit BEGIN/COMMIT
        commands included in the string to divide it into multiple
        transactions.  (See Section 52.2.2.1
        for more details about how the server handles multi-query strings.)
        psql prints only the last query result
        it receives for each request; in this example, although all
        three SELECTs are indeed executed, psql
        only prints the 3.
        
   The various \d commands accept a pattern parameter to specify the
   object name(s) to be displayed.  In the simplest case, a pattern
   is just the exact name of the object.  The characters within a
   pattern are normally folded to lower case, just as in SQL names;
   for example, \dt FOO will display the table named
   foo.  As in SQL names, placing double quotes around
   a pattern stops folding to lower case.  Should you need to include
   an actual double quote character in a pattern, write it as a pair
   of double quotes within a double-quote sequence; again this is in
   accord with the rules for SQL quoted identifiers.  For example,
   \dt "FOO""BAR" will display the table named
   FOO"BAR (not foo"bar).  Unlike the normal
   rules for SQL names, you can put double quotes around just part
   of a pattern, for instance \dt FOO"FOO"BAR will display
   the table named fooFOObar.
  
   Whenever the pattern parameter
   is omitted completely, the \d commands display all objects
   that are visible in the current schema search path — this is
   equivalent to using * as the pattern.
   (An object is said to be visible if its
   containing schema is in the search path and no object of the same
   kind and name appears earlier in the search path. This is equivalent to the
   statement that the object can be referenced by name without explicit
   schema qualification.)
   To see all objects in the database regardless of visibility,
   use *.* as the pattern.
  
   Within a pattern, * matches any sequence of characters
   (including no characters) and ? matches any single character.
   (This notation is comparable to Unix shell file name patterns.)
   For example, \dt int* displays tables whose names
   begin with int.  But within double quotes, *
   and ? lose these special meanings and are just matched
   literally.
  
   A pattern that contains a dot (.) is interpreted as a schema
   name pattern followed by an object name pattern.  For example,
   \dt foo*.*bar* displays all tables whose table name
   includes bar that are in schemas whose schema name
   starts with foo.  When no dot appears, then the pattern
   matches only objects that are visible in the current schema search path.
   Again, a dot within double quotes loses its special meaning and is matched
   literally.
  
   Advanced users can use regular-expression notations such as character
   classes, for example [0-9] to match any digit.  All regular
   expression special characters work as specified in
   Section 9.7.3, except for . which
   is taken as a separator as mentioned above, * which is
   translated to the regular-expression notation .*,
   ? which is translated to ., and
   $ which is matched literally.  You can emulate
   these pattern characters at need by writing
   ? for .,
   ( for
   R+|)R*( for
   R|)R?$ is not needed as a regular-expression character since
   the pattern must match the whole name, unlike the usual
   interpretation of regular expressions (in other words, $
   is automatically appended to your pattern).  Write * at the
   beginning and/or end if you don't wish the pattern to be anchored.
   Note that within double quotes, all regular expression special characters
   lose their special meanings and are matched literally.  Also, the regular
   expression special characters are matched literally in operator name
   patterns (i.e., the argument of \do).
  
psql provides variable substitution features similar to common Unix command shells. Variables are simply name/value pairs, where the value can be any string of any length. The name must consist of letters (including non-Latin letters), digits, and underscores.
    To set a variable, use the psql meta-command
    \set.  For example,
testdb=> \set foo bar
    sets the variable foo to the value
    bar. To retrieve the content of the variable, precede
    the name with a colon, for example:
testdb=> \echo :foo
bar
This works in both regular SQL commands and meta-commands; there is more detail in SQL Interpolation, below.
    If you call \set without a second argument, the
    variable is set to an empty-string value. To unset (i.e., delete)
    a variable, use the command \unset.  To show the
    values of all variables, call \set without any argument.
    
    The arguments of \set are subject to the same
    substitution rules as with other commands. Thus you can construct
    interesting references such as \set :foo
    'something' and get “soft links” or
    “variable variables” of Perl
    or PHP fame,
    respectively. Unfortunately (or fortunately?), there is no way to do
    anything useful with these constructs. On the other hand,
    \set bar :foo is a perfectly valid way to copy a
    variable.
    
A number of these variables are treated specially by psql. They represent certain option settings that can be changed at run time by altering the value of the variable, or in some cases represent changeable state of psql. By convention, all specially treated variables' names consist of all upper-case ASCII letters (and possibly digits and underscores). To ensure maximum compatibility in the future, avoid using such variable names for your own purposes.
    Variables that control psql's behavior
    generally cannot be unset or set to invalid values.  An \unset
    command is allowed but is interpreted as setting the variable to its
    default value.  A \set command without a second argument is
    interpreted as setting the variable to on, for control
    variables that accept that value, and is rejected for others.  Also,
    control variables that accept the values on
    and off will also accept other common spellings of Boolean
    values, such as true and false.
   
The specially treated variables are:
AUTOCOMMIT
       
      
        When on (the default), each SQL command is automatically
        committed upon successful completion.  To postpone commit in this
        mode, you must enter a BEGIN or START
        TRANSACTION SQL command.  When off or unset, SQL
        commands are not committed until you explicitly issue
        COMMIT or END.  The autocommit-off
        mode works by issuing an implicit BEGIN for you, just
        before any command that is not already in a transaction block and
        is not itself a BEGIN or other transaction-control
        command, nor a command that cannot be executed inside a transaction
        block (such as VACUUM).
        
         In autocommit-off mode, you must explicitly abandon any failed
         transaction by entering ABORT or ROLLBACK.
         Also keep in mind that if you exit the session
         without committing, your work will be lost.
        
         The autocommit-on mode is PostgreSQL's traditional
         behavior, but autocommit-off is closer to the SQL spec.  If you
         prefer autocommit-off, you might wish to set it in the system-wide
         psqlrc file or your
         ~/.psqlrc file.
        
COMP_KEYWORD_CASE
        Determines which letter case to use when completing an SQL key word.
        If set to lower or upper, the
        completed word will be in lower or upper case, respectively.  If set
        to preserve-lower
        or preserve-upper (the default), the completed word
        will be in the case of the word already entered, but words being
        completed without anything entered will be in lower or upper case,
        respectively.
        
DBNAMEThe name of the database you are currently connected to. This is set every time you connect to a database (including program start-up), but can be changed or unset.
ECHO
        If set to all, all nonempty input lines are printed
        to standard output as they are read.  (This does not apply to lines
        read interactively.)  To select this behavior on program
        start-up, use the switch -a. If set to
        queries,
        psql prints each query to standard output
        as it is sent to the server. The switch to select this behavior is
        -e. If set to errors, then only
        failed queries are displayed on standard error output. The switch
        for this behavior is -b. If set to
        none (the default), then no queries are displayed.
        
ECHO_HIDDEN
        When this variable is set to on and a backslash command
        queries the database, the query is first shown.
        This feature helps you to study
        PostgreSQL internals and provide
        similar functionality in your own programs. (To select this behavior
        on program start-up, use the switch -E.)  If you set
        this variable to the value noexec, the queries are
        just shown but are not actually sent to the server and executed.
        The default value is off.
        
ENCODING
        The current client character set encoding.
        This is set every time you connect to a database (including
        program start-up), and when you change the encoding
        with \encoding, but it can be changed or unset.
        
ERROR
         true if the last SQL query failed, false if
         it succeeded.  See also SQLSTATE.
        
FETCH_COUNT
        If this variable is set to an integer value greater than zero,
        the results of SELECT queries are fetched
        and displayed in groups of that many rows, rather than the
        default behavior of collecting the entire result set before
        display.  Therefore only a
        limited amount of memory is used, regardless of the size of
        the result set.  Settings of 100 to 1000 are commonly used
        when enabling this feature.
        Keep in mind that when using this feature, a query might
        fail after having already displayed some rows.
        
        Although you can use any output format with this feature,
        the default aligned format tends to look bad
        because each group of FETCH_COUNT rows
        will be formatted separately, leading to varying column
        widths across the row groups.  The other output formats work better.
        
HIDE_TABLEAM
         If this variable is set to true, a table's access
         method details are not displayed. This is mainly useful for
         regression tests.
        
HISTCONTROL
         If this variable is set to ignorespace,
         lines which begin with a space are not entered into the history
         list. If set to a value of ignoredups, lines
         matching the previous history line are not entered. A value of
         ignoreboth combines the two options. If
         set to none (the default), all lines
         read in interactive mode are saved on the history list.
        
This feature was shamelessly plagiarized from Bash.
HISTFILE
        The file name that will be used to store the history list.  If unset,
        the file name is taken from the PSQL_HISTORY
        environment variable.  If that is not set either, the default
        is ~/.psql_history,
        or %APPDATA%\postgresql\psql_history on Windows.
        For example, putting:
\set HISTFILE ~/.psql_history- :DBNAME
        in ~/.psqlrc will cause
        psql to maintain a separate history for
        each database.
        
This feature was shamelessly plagiarized from Bash.
HISTSIZEThe maximum number of commands to store in the command history (default 500). If set to a negative value, no limit is applied.
This feature was shamelessly plagiarized from Bash.
HOSTThe database server host you are currently connected to. This is set every time you connect to a database (including program start-up), but can be changed or unset.
IGNOREEOFIf set to 1 or less, sending an EOF character (usually Control+D) to an interactive session of psql will terminate the application. If set to a larger numeric value, that many consecutive EOF characters must be typed to make an interactive session terminate. If the variable is set to a non-numeric value, it is interpreted as 10. The default is 0.
This feature was shamelessly plagiarized from Bash.
LASTOID
        The value of the last affected OID, as returned from an
        INSERT or \lo_import
        command. This variable is only guaranteed to be valid until
        after the result of the next SQL command has
        been displayed.
        PostgreSQL servers since version 12 do not
        support OID system columns anymore, thus LASTOID will always be 0
        following INSERT when targeting such servers.
        
LAST_ERROR_MESSAGELAST_ERROR_SQLSTATE
         The primary error message and associated SQLSTATE code for the most
         recent failed query in the current psql session, or
         an empty string and 00000 if no error has occurred in
         the current session.
        
ON_ERROR_ROLLBACK
       
      
        When set to on, if a statement in a transaction block
        generates an error, the error is ignored and the transaction
        continues. When set to interactive, such errors are only
        ignored in interactive sessions, and not when reading script
        files. When set to off (the default), a statement in a
        transaction block that generates an error aborts the entire
        transaction. The error rollback mode works by issuing an
        implicit SAVEPOINT for you, just before each command
        that is in a transaction block, and then rolling back to the
        savepoint if the command fails.
        
ON_ERROR_STOP
        By default, command processing continues after an error.  When this
        variable is set to on, processing will instead stop
        immediately.  In interactive mode,
        psql will return to the command prompt;
        otherwise, psql will exit, returning
        error code 3 to distinguish this case from fatal error
        conditions, which are reported using error code 1.  In either case,
        any currently running scripts (the top-level script, if any, and any
        other scripts which it may have in invoked) will be terminated
        immediately.  If the top-level command string contained multiple SQL
        commands, processing will stop with the current command.
        
PORTThe database server port to which you are currently connected. This is set every time you connect to a database (including program start-up), but can be changed or unset.
PROMPT1PROMPT2PROMPT3These specify what the prompts psql issues should look like. See Prompting below.
QUIET
        Setting this variable to on is equivalent to the command
        line option -q. It is probably not too useful in
        interactive mode.
        
ROW_COUNTThe number of rows returned or affected by the last SQL query, or 0 if the query failed or did not report a row count.
SERVER_VERSION_NAMESERVER_VERSION_NUM
        The server's version number as a string, for
        example 9.6.2, 10.1 or 11beta1,
        and in numeric form, for
        example 90602 or 100001.
        These are set every time you connect to a database
        (including program start-up), but can be changed or unset.
        
SHOW_CONTEXT
        This variable can be set to the
        values never, errors, or always
        to control whether CONTEXT fields are displayed in
        messages from the server. The default is errors (meaning
        that context will be shown in error messages, but not in notice or
        warning messages).  This setting has no effect
        when VERBOSITY is set to terse
        or sqlstate.
        (See also \errverbose, for use when you want a verbose
        version of the error you just got.)
        
SINGLELINE
        Setting this variable to on is equivalent to the command
        line option -S.
        
SINGLESTEP
        Setting this variable to on is equivalent to the command
        line option -s.
        
SQLSTATE
         The error code (see Appendix A) associated
         with the last SQL query's failure, or 00000 if it
         succeeded.
        
USERThe database user you are currently connected as. This is set every time you connect to a database (including program start-up), but can be changed or unset.
VERBOSITY
        This variable can be set to the values default,
        verbose, terse,
        or sqlstate to control the verbosity of error
        reports.
        (See also \errverbose, for use when you want a verbose
        version of the error you just got.)
        
VERSIONVERSION_NAMEVERSION_NUM
        These variables are set at program start-up to reflect
        psql's version, respectively as a verbose string,
        a short string (e.g., 9.6.2, 10.1,
        or 11beta1), and a number (e.g., 90602
        or 100001).  They can be changed or unset.
        
    A key feature of psql
    variables is that you can substitute (“interpolate”)
    them into regular SQL statements, as well as the
    arguments of meta-commands.  Furthermore,
    psql provides facilities for
    ensuring that variable values used as SQL literals and identifiers are
    properly quoted.  The syntax for interpolating a value without
    any quoting is to prepend the variable name with a colon
    (:).  For example,
testdb=>\set foo 'my_table'testdb=>SELECT * FROM :foo;
    would query the table my_table. Note that this
    may be unsafe: the value of the variable is copied literally, so it can
    contain unbalanced quotes, or even backslash commands. You must make sure
    that it makes sense where you put it.
    
When a value is to be used as an SQL literal or identifier, it is safest to arrange for it to be quoted. To quote the value of a variable as an SQL literal, write a colon followed by the variable name in single quotes. To quote the value as an SQL identifier, write a colon followed by the variable name in double quotes. These constructs deal correctly with quotes and other special characters embedded within the variable value. The previous example would be more safely written this way:
testdb=>\set foo 'my_table'testdb=>SELECT * FROM :"foo";
    Variable interpolation will not be performed within quoted
    SQL literals and identifiers.  Therefore, a
    construction such as ':foo' doesn't work to produce a quoted
    literal from a variable's value (and it would be unsafe if it did work,
    since it wouldn't correctly handle quotes embedded in the value).
    
One example use of this mechanism is to copy the contents of a file into a table column. First load the file into a variable and then interpolate the variable's value as a quoted string:
testdb=>\set content `cat my_file.txt`testdb=>INSERT INTO my_table VALUES (:'content');
    (Note that this still won't work if my_file.txt contains NUL bytes.
    psql does not support embedded NUL bytes in variable values.)
    
    Since colons can legally appear in SQL commands, an apparent attempt
    at interpolation (that is, :name,
    :'name', or :"name") is not
    replaced unless the named variable is currently set. In any case, you
    can escape a colon with a backslash to protect it from substitution.
    
    The :{? special syntax returns TRUE
    or FALSE depending on whether the variable exists or not, and is thus
    always substituted, unless the colon is backslash-escaped.
    name}
The colon syntax for variables is standard SQL for embedded query languages, such as ECPG. The colon syntaxes for array slices and type casts are PostgreSQL extensions, which can sometimes conflict with the standard usage. The colon-quote syntax for escaping a variable's value as an SQL literal or identifier is a psql extension.
    The prompts psql issues can be customized
    to your preference. The three variables PROMPT1,
    PROMPT2, and PROMPT3 contain strings
    and special escape sequences that describe the appearance of the
    prompt. Prompt 1 is the normal prompt that is issued when
    psql requests a new command. Prompt 2 is
    issued when more input is expected during command entry, for example
    because the command was not terminated with a semicolon or a quote
    was not closed.
    Prompt 3 is issued when you are running an SQL
    COPY FROM STDIN command and you need to type in
    a row value on the terminal.
    
    The value of the selected prompt variable is printed literally,
    except where a percent sign (%) is encountered.
    Depending on the next character, certain other text is substituted
    instead. Defined substitutions are:
    
%M
          The full host name (with domain name) of the database server,
          or [local] if the connection is over a Unix
          domain socket, or
          [local:,
          if the Unix domain socket is not at the compiled in default
          location.
        /dir/name]
%m
          The host name of the database server, truncated at the
          first dot, or [local] if the connection is
          over a Unix domain socket.
         
%>The port number at which the database server is listening.
%n
          The database session user name.  (The expansion of this
          value might change during a database session as the result
          of the command SET SESSION
          AUTHORIZATION.)
         
%/The name of the current database.
%~Like %/, but the output is ~
         (tilde) if the database is your default database.
%#
          If the session user is a database superuser, then a
          #, otherwise a >.
          (The expansion of this value might change during a database
          session as the result of the command SET SESSION
          AUTHORIZATION.)
         
%pThe process ID of the backend currently connected to.
%R
        In prompt 1 normally =,
        but @ if the session is in an inactive branch of a
        conditional block, or ^ if in single-line mode,
        or ! if the session is disconnected from the
        database (which can happen if \connect fails).
        In prompt 2 %R is replaced by a character that
        depends on why psql expects more input:
        - if the command simply wasn't terminated yet,
        but * if there is an unfinished
        /* ... */ comment,
        a single quote if there is an unfinished quoted string,
        a double quote if there is an unfinished quoted identifier,
        a dollar sign if there is an unfinished dollar-quoted string,
        or ( if there is an unmatched left parenthesis.
        In prompt 3 %R doesn't produce anything.
        
%x
        Transaction status: an empty string when not in a transaction
        block, or * when in a transaction block, or
        ! when in a failed transaction block, or ?
        when the transaction state is indeterminate (for example, because
        there is no connection).
        
%l
          The line number inside the current statement, starting from 1.
         
%digitsThe character with the indicated octal code is substituted.
%:name:
        The value of the psql variable
        name. See
        Variables, above, for details.
        
%`command`
        The output of command, similar to ordinary
        “back-tick” substitution.
        
%[ ... %]
         Prompts can contain terminal control characters which, for
         example, change the color, background, or style of the prompt
         text, or change the title of the terminal window. In order for
         the line editing features of Readline to work properly, these
         non-printing control characters must be designated as invisible
         by surrounding them with %[ and
         %]. Multiple pairs of these can occur within
         the prompt.  For example:
testdb=> \set PROMPT1 '%[%033[1;33;40m%]%n@%/%R%[%033[0m%]%# '
         results in a boldfaced (1;) yellow-on-black
         (33;40) prompt on VT100-compatible, color-capable
         terminals.
        
%w
        Whitespace of the same width as the most recent output of
        PROMPT1.  This can be used as a
        PROMPT2 setting, so that multi-line statements are
        aligned with the first line, but there is no visible secondary prompt.
        
    To insert a percent sign into your prompt, write
    %%. The default prompts are
    '%/%R%x%# ' for prompts 1 and 2, and
    '>> ' for prompt 3.
    
This feature was shamelessly plagiarized from tcsh.
    psql supports the Readline
    library for convenient line editing and retrieval. The command
    history is automatically saved when psql
    exits and is reloaded when
    psql starts up. Tab-completion is also
    supported, although the completion logic makes no claim to be an
    SQL parser.  The queries generated by tab-completion
    can also interfere with other SQL commands, e.g., SET
    TRANSACTION ISOLATION LEVEL.
    If for some reason you do not like the tab completion, you
    can turn it off by putting this in a file named
    .inputrc in your home directory:
$if psql set disable-completion on $endif
(This is not a psql but a Readline feature. Read its documentation for further details.)
COLUMNS
      If \pset columns is zero, controls the
      width for the wrapped format and width for determining
      if wide output requires the pager or should be switched to the
      vertical format in expanded auto mode.
     
PGDATABASEPGHOSTPGPORTPGUSERDefault connection parameters (see Section 33.14).
PG_COLOR
      Specifies whether to use color in diagnostic messages. Possible values
      are always, auto and
      never.
     
PSQL_EDITOREDITORVISUAL
      Editor used by the \e, \ef,
      and \ev commands.
      These variables are examined in the order listed;
      the first that is set is used.
      If none of them is set, the default is to use vi
      on Unix systems or notepad.exe on Windows systems.
     
PSQL_EDITOR_LINENUMBER_ARG
      When \e, \ef, or
      \ev is used
      with a line number argument, this variable specifies the
      command-line argument used to pass the starting line number to
      the user's editor.  For editors such as Emacs or
      vi, this is a plus sign.  Include a trailing
      space in the value of the variable if there needs to be space
      between the option name and the line number.  Examples:
PSQL_EDITOR_LINENUMBER_ARG='+' PSQL_EDITOR_LINENUMBER_ARG='--line '
      The default is + on Unix systems
      (corresponding to the default editor vi,
      and useful for many other common editors); but there is no
      default on Windows systems.
     
PSQL_HISTORY
      Alternative location for the command history file. Tilde (~) expansion is performed.
     
PSQL_PAGERPAGER
      If a query's results do not fit on the screen, they are piped
      through this command. Typical values are more
      or less.
      Use of the pager can be disabled by setting PSQL_PAGER
      or PAGER to an empty string, or by adjusting the
      pager-related options of the \pset command.
      These variables are examined in the order listed;
      the first that is set is used.
      If none of them is set, the default is to use more on most
      platforms, but less on Cygwin.
     
PSQLRC
      Alternative location of the user's .psqlrc file. Tilde (~) expansion is performed.
     
SHELL
      Command executed by the \! command.
     
TMPDIR
      Directory for storing temporary files.  The default is
      /tmp.
     
This utility, like most other PostgreSQL utilities, also uses the environment variables supported by libpq (see Section 33.14).
psqlrc and ~/.psqlrc
     Unless it is passed an -X option,
     psql attempts to read and execute commands
     from the system-wide startup file (psqlrc) and then
     the user's personal startup file (~/.psqlrc), after
     connecting to the database but before accepting normal commands.
     These files can be used to set up the client and/or the server to taste,
     typically with \set and SET
     commands.
    
     The system-wide startup file is named psqlrc and is
     sought in the installation's “system configuration” directory,
     which is most reliably identified by running pg_config
     --sysconfdir.  By default this directory will be ../etc/
     relative to the directory containing
     the PostgreSQL executables.  The name of this
     directory can be set explicitly via the PGSYSCONFDIR
     environment variable.
    
     The user's personal startup file is named .psqlrc
     and is sought in the invoking user's home directory.  On Windows, which
     lacks such a concept, the personal startup file is named
     %APPDATA%\postgresql\psqlrc.conf.
     The location of the user's startup file can be set explicitly via
     the PSQLRC environment variable.
    
     Both the system-wide startup file and the user's personal startup file
     can be made psql-version-specific
     by appending a dash and the PostgreSQL
     major or minor release number to the file name,
     for example ~/.psqlrc-9.2 or
     ~/.psqlrc-9.2.5.  The most specific
     version-matching file will be read in preference to a
     non-version-specific file.
    
.psql_history
     The command-line history is stored in the file
     ~/.psql_history, or
     %APPDATA%\postgresql\psql_history on Windows.
    
     The location of the history file can be set explicitly via
     the HISTFILE psql variable or
     the PSQL_HISTORY environment variable.
    
psql works best with servers of the same
       or an older major version.  Backslash commands are particularly likely
       to fail if the server is of a newer version than psql
       itself.  However, backslash commands of the \d family should
       work with servers of versions back to 7.4, though not necessarily with
       servers newer than psql itself.  The general
       functionality of running SQL commands and displaying query results
       should also work with servers of a newer major version, but this cannot
       be guaranteed in all cases.
      
If you want to use psql to connect to several servers of different major versions, it is recommended that you use the newest version of psql. Alternatively, you can keep around a copy of psql from each major version and be sure to use the version that matches the respective server. But in practice, this additional complication should not be necessary.
       Before PostgreSQL 9.6,
       the -c option implied -X
       (--no-psqlrc); this is no longer the case.
      
Before PostgreSQL 8.4, psql allowed the first argument of a single-letter backslash command to start directly after the command, without intervening whitespace. Now, some whitespace is required.
psql is built as a “console application”. Since the Windows console windows use a different encoding than the rest of the system, you must take special care when using 8-bit characters within psql. If psql detects a problematic console code page, it will warn you at startup. To change the console code page, two things are necessary:
      Set the code page by entering cmd.exe /c chcp
      1252. (1252 is a code page that is appropriate for
      German; replace it with your value.) If you are using Cygwin,
      you can put this command in /etc/profile.
     
      Set the console font to Lucida Console, because the
      raster font does not work with the ANSI code page.
     
The first example shows how to spread a command over several lines of input. Notice the changing prompt:
testdb=>CREATE TABLE my_table (testdb(>first integer not null default 0,testdb(>second text)testdb->;CREATE TABLE
Now look at the table definition again:
testdb=> \d my_table
              Table "public.my_table"
 Column |  Type   | Collation | Nullable | Default
--------+---------+-----------+----------+---------
 first  | integer |           | not null | 0
 second | text    |           |          | 
Now we change the prompt to something more interesting:
testdb=> \set PROMPT1 '%n@%m %~%R%# '
peter@localhost testdb=>
Let's assume you have filled the table with data and want to take a look at it:
peter@localhost testdb=> SELECT * FROM my_table;
 first | second
-------+--------
     1 | one
     2 | two
     3 | three
     4 | four
(4 rows)
  You can display tables in different ways by using the
  \pset command:
peter@localhost testdb=>\pset border 2Border style is 2. peter@localhost testdb=>SELECT * FROM my_table;+-------+--------+ | first | second | +-------+--------+ | 1 | one | | 2 | two | | 3 | three | | 4 | four | +-------+--------+ (4 rows) peter@localhost testdb=>\pset border 0Border style is 0. peter@localhost testdb=>SELECT * FROM my_table;first second ----- ------ 1 one 2 two 3 three 4 four (4 rows) peter@localhost testdb=>\pset border 1Border style is 1. peter@localhost testdb=>\pset format csvOutput format is csv. peter@localhost testdb=>\pset tuples_onlyTuples only is on. peter@localhost testdb=>SELECT second, first FROM my_table;one,1 two,2 three,3 four,4 peter@localhost testdb=>\pset format unalignedOutput format is unaligned. peter@localhost testdb=>\pset fieldsep '\t'Field separator is " ". peter@localhost testdb=>SELECT second, first FROM my_table;one 1 two 2 three 3 four 4
Alternatively, use the short commands:
peter@localhost testdb=>\a \t \xOutput format is aligned. Tuples only is off. Expanded display is on. peter@localhost testdb=>SELECT * FROM my_table;-[ RECORD 1 ]- first | 1 second | one -[ RECORD 2 ]- first | 2 second | two -[ RECORD 3 ]- first | 3 second | three -[ RECORD 4 ]- first | 4 second | four
  Also, these output format options can be set for just one query by using
  \g:
peter@localhost testdb=>SELECT * FROM my_tablepeter@localhost testdb->\g (format=aligned tuples_only=off expanded=on)-[ RECORD 1 ]- first | 1 second | one -[ RECORD 2 ]- first | 2 second | two -[ RECORD 3 ]- first | 3 second | three -[ RECORD 4 ]- first | 4 second | four
  When suitable, query results can be shown in a crosstab representation
  with the \crosstabview command:
testdb=>SELECT first, second, first > 2 AS gt2 FROM my_table;first | second | gt2 -------+--------+----- 1 | one | f 2 | two | f 3 | three | t 4 | four | t (4 rows) testdb=>\crosstabview first secondfirst | one | two | three | four -------+-----+-----+-------+------ 1 | f | | | 2 | | f | | 3 | | | t | 4 | | | | t (4 rows)
This second example shows a multiplication table with rows sorted in reverse numerical order and columns with an independent, ascending numerical order.
testdb=>SELECT t1.first as "A", t2.first+100 AS "B", t1.first*(t2.first+100) as "AxB",testdb(>row_number() over(order by t2.first) AS ordtestdb(>FROM my_table t1 CROSS JOIN my_table t2 ORDER BY 1 DESCtestdb(>\crosstabview "A" "B" "AxB" ordA | 101 | 102 | 103 | 104 ---+-----+-----+-----+----- 4 | 404 | 408 | 412 | 416 3 | 303 | 306 | 309 | 312 2 | 202 | 204 | 206 | 208 1 | 101 | 102 | 103 | 104 (4 rows)