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The view table_constraints contains all constraints belonging to tables owned by the current user.
Table 30-32. 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 | character_data | YES if the constraint is deferrable, NO if not | 
| initially_deferred | character_data | YES if the constraint is deferrable and initially deferred, NO if not |