view_column_usage   The view view_column_usage identifies all
   columns that are used in the query expression of a view (the
   SELECT statement that defines the view).  A
   column is only included if the table that contains the column is
   owned by a currently enabled role.
  
Columns of system tables are not included. This should be fixed sometime.
Table 36.59. view_column_usage Columns
| Name | Data Type | Description | 
|---|---|---|
| view_catalog | sql_identifier | Name of the database that contains the view (always the current database) | 
| view_schema | sql_identifier | Name of the schema that contains the view | 
| view_name | sql_identifier | Name of the view | 
| table_catalog | sql_identifier | Name of the database that contains the table that contains the column that is used by the view (always the current database) | 
| table_schema | sql_identifier | Name of the schema that contains the table that contains the column that is used by the view | 
| table_name | sql_identifier | Name of the table that contains the column that is used by the view | 
| column_name | sql_identifier | Name of the column that is used by the view |