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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