pg_rewrite

The pg_rewrite system catalog table stores rewrite rules for tables and views. pg_class.relhasrules must be true if a table has any rules in this catalog.

Table 1. pg_catalog.pg_rewrite

column type references description
rulename name   Rule name.
ev_class oid pg_class.oid The table this rule is for.
ev_attr smallint   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 boolean   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.