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PostgreSQL 8.2.23 Documentation
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CREATE CONSTRAINT TRIGGER

Name

CREATE CONSTRAINT TRIGGER -- define a new constraint trigger

Synopsis

CREATE CONSTRAINT TRIGGER name
    AFTER event [ OR ... ]
    ON table_name
    [ FROM referenced_table_name ]
    { NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } }
    FOR EACH ROW
    EXECUTE PROCEDURE funcname ( arguments )

Description

CREATE CONSTRAINT TRIGGER is used within CREATE TABLE/ALTER TABLE and by pg_dump to create the special triggers for referential integrity. It is not intended for general use.

Parameters

name: The name of the constraint trigger. The actual name of the created trigger will be of the form RI_ConstraintTrigger_0000 (where 0000 is some number assigned by the server). Use this assigned name when dropping the trigger.
event: One of INSERT, UPDATE, or DELETE; this specifies the event that will fire the trigger. Multiple events can be specified using OR.
table_name: The (possibly schema-qualified) name of the table in which the triggering events occur.
referenced_table_name: The (possibly schema-qualified) name of the table referenced by the constraint. Used by foreign key constraints triggers.
DEFERRABLE NOT DEFERRABLE INITIALLY IMMEDIATE INITIALLY DEFERRED: See the CREATE TABLE documentation for details of these constraint options.
funcname(args): The function to call as part of the trigger processing. See CREATE TRIGGER for details.

Compatibility

CREATE CONTRAINT TRIGGER is a PostgreSQL extension of the SQL standard.

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