37.52. `table_constraints`
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## 37.52. `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 37.50. `table_constraints` Columns

Column 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
`enforced` `yes_or_no` Applies to a feature not available in PostgreSQL (currently always `YES`)
`nulls_distinct` `yes_or_no` If the constraint is a unique constraint, then `YES` if the constraint treats nulls as distinct or `NO` if it treats nulls as not distinct, otherwise null for other types of constraints.

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