sql_packages
   The table sql_packages contains information
   about which feature packages defined in the SQL standard are
   supported by PostgreSQL.  Refer to Appendix D for background information on feature packages.
  
Table 36.45. sql_packages Columns
| Name | Data Type | Description | 
|---|---|---|
feature_id | character_data | Identifier string of the package | 
feature_name | character_data | Descriptive name of the package | 
is_supported | yes_or_no | 
       YES if the package is fully supported by the
       current version of PostgreSQL, NO if not
       | 
is_verified_by | character_data | Always null, since the PostgreSQL development group does not perform formal testing of feature conformance | 
comments | character_data | Possibly a comment about the supported status of the package |