CREATE CONSTRAINT TRIGGER — define a new constraint trigger
CREATE CONSTRAINT TRIGGERname
AFTERevent [ OR ... ]
ONtable_name
[ FROMreferenced_table_name
] { NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } } FOR EACH ROW EXECUTE PROCEDUREfuncname
(arguments
)
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.
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.