pg_rewrite

PostgreSQL 7.3.4 Documentation
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# 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.

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