CREATE CONSTRAINT TRIGGER SQL - Language Statements CREATE CONSTRAINT TRIGGER define a new constraint trigger CREATE CONSTRAINT CREATE CONSTRAINT TRIGGER name AFTER events ON tablename constraint attributes FOR EACH ROW EXECUTE PROCEDURE funcname ( args ) 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. events The event categories for which this trigger should be fired. tablename The name (possibly schema-qualified) of the table in which the triggering events occur. constraint Actual constraint specification. attributes The constraint attributes. funcname(args) The function to call as part of the trigger processing.