PostgreSQL 9.2.3 Documentation
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# 34.50. `table_constraints`

The view `table_constraints` contains all constraints belonging to tables that the current user owns or has some privilege other than `SELECT` on.

Table 34-48. `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

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