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3.17. pg_rewrite

This system catalog stores rewrite rules for tables and views.

Table 3-17. pg_rewrite Columns

Name Type References Description
rulename name   Rule name
ev_type char   Event type that the rule is for: '1' = SELECT, '2' = UPDATE, '3' = INSERT, '4' = DELETE
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)
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.