35.9. `check_constraints`
Prev | Up | Chapter 35. The Information Schema | Home | Next

## 35.9. `check_constraints` #

The view `check_constraints` contains all check constraints, either defined on a table or on a domain, that are owned by a currently enabled role. (The owner of the table or domain is the owner of the constraint.)

The SQL standard considers not-null constraints to be check constraints with a `CHECK (`column_name` IS NOT NULL)` expression. So not-null constraints are also included here and don't have a separate view.

Table 35.7. `check_constraints` Columns

Column Type Description
`constraint_catalog` `sql_identifier` Name of the database containing the constraint (always the current database)
`constraint_schema` `sql_identifier` Name of the schema containing the constraint
`constraint_name` `sql_identifier` Name of the constraint
`check_clause` `character_data` The check expression of the check constraint

Prev | Up | Next
35.8. `check_constraint_routine_usage` | Home | 35.10. `collations`