18th October 2018: PostgreSQL 11 Released!
Unsupported versions: 7.2 / 7.1

3.14. 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 3-14. 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 consraint expression

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