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CREATE CONSTRAINT TRIGGER(7)     SQL Commands     CREATE CONSTRAINT TRIGGER(7)



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 creates a constraint trigger. This is the same as a regular trigger except that the
       timing of the trigger firing can be adjusted using SET CONSTRAINTS [set_constraints(7)].   Constraint  triggers
       must  be AFTER ROW triggers. They can be fired either at the end of the statement causing the triggering event,
       or at the end of the containing transaction; in the latter case  they  are  said  to  be  deferred.  A  pending
       deferred-trigger firing can also be forced to happen immediately by using SET CONSTRAINTS.

PARAMETERS
       name   The  name  of the constraint trigger. This is also the name to use when modifying the trigger's behavior
              using SET CONSTRAINTS.  The name cannot be schema-qualified -- the trigger inherits the schema of its ta-
              ble.

       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 another table referenced by the constraint. This option is  used
              for foreign-key constraints and is not recommended for general use.

       DEFERRABLE

       NOT DEFERRABLE

       INITIALLY IMMEDIATE

       INITIALLY DEFERRED
              The  default timing of the trigger.  See the CREATE TABLE [create_table(7)] documentation for details of
              these constraint options.

       funcname
              The function to call when the trigger is fired. See CREATE TRIGGER [create_trigger(7)] for details.

       arguments
              Optional argument strings to pass to the trigger function. See CREATE  TRIGGER  [create_trigger(7)]  for
              details.

COMPATIBILITY
       CREATE CONSTRAINT TRIGGER is a PostgreSQL extension of the SQL standard.

SEE ALSO
       CREATE TRIGGER [create_trigger(7)], DROP TRIGGER [drop_trigger(7)], SET CONSTRAINTS [set_constraints(7)]



SQL - Language Statements         2014-02-17      CREATE CONSTRAINT TRIGGER(7)