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Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly.
The view table_constraints contains all constraints belonging to tables that the current user owns or has some non-SELECT privilege on.
Table 33-46. table_constraints Columns
| Name | Data Type | Description |
|---|---|---|
| constraint_catalog | sql_identifier | Name of the database that contains the constraint (always the current database) |
| constraint_schema | sql_identifier | Name of the schema that contains the constraint |
| constraint_name | sql_identifier | Name of the constraint |
| table_catalog | sql_identifier | Name of the database that contains the table (always the current database) |
| table_schema | sql_identifier | Name of the schema that contains the table |
| table_name | sql_identifier | Name of the table |
| constraint_type | character_data | Type of the constraint: CHECK, FOREIGN KEY, PRIMARY KEY, or UNIQUE |
| is_deferrable | yes_or_no | YES if the constraint is deferrable, NO if not |
| initially_deferred | yes_or_no | YES if the constraint is deferrable and initially deferred, NO if not |