ALTER RULE

PostgreSQL 9.4.12 Documentation
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ALTER RULE -- change the definition of a rule

ALTER RULE name ON table_name RENAME TO new_name

ALTER RULE changes properties of an existing rule. Currently, the only available action is to change the rule's name.

To use ALTER RULE , you must own the table or view that the rule applies to.

name: The name of an existing rule to alter.
table_name: The name (optionally schema-qualified) of the table or view that the rule applies to.
new_name: The new name for the rule.

To rename an existing rule:

ALTER RULE notify_all ON emp RENAME TO notify_me;

ALTER RULE is a PostgreSQL language extension, as is the entire query rewrite system.