PostgreSQL 9.3.9 Documentation
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# 34.9. `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.)

Table 34-7. `check_constraints` Columns

Name | Data 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

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