PostgreSQL 7.2.1 Documentation
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# 3.16. pg_relcheck

This system catalog stores CHECK constraints on tables. (Column constraints are not treated specially. Every column constraint is equivalent to some table constraint.) See under CREATE TABLE for more information.

Table 3-16. pg_relcheck Columns

Name | Type | References | Description
--- | --- | --- | ---
rcrelid | `oid` | pg_class.oid | The table this check constraint is on
rcname | `name` |  | Constraint name
rcbin | `text` |  | An internal representation of the constraint expression
rcsrc | `text` |  | A human-readable representation of the constraint expression

> Note: `pg_class`.`relchecks` needs to match up with the entries in this table.

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