11th October 2018: PostgreSQL 11 RC 1 Released!
Supported Versions: Current (10) / 9.6 / 9.5 / 9.4 / 9.3
Development Versions: 11 / devel
Unsupported versions: 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1 / 8.0 / 7.4 / 7.3 / 7.2

3.25. pg_rewrite

This system catalog stores rewrite rules for tables and views.

Table 3-25. pg_rewrite Columns

Name Type References Description
rulename name   Rule name
ev_class oid pg_class.oid The table this rule is for
ev_attr int2   The column this rule is for (currently, always zero to indicate the whole table)
ev_type char   Event type that the rule is for: '1' = SELECT, '2' = UPDATE, '3' = INSERT, '4' = DELETE
is_instead bool   True if the rule is an INSTEAD rule
ev_qual text   Expression tree (in the form of a nodeToString representation) for the rule's qualifying condition
ev_action text   Query tree (in the form of a nodeToString representation) for the rule's action

Note: pg_class.relhasrules must be true if a table has any rules in this catalog.