pg_rewrite

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 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 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.