Trigger In PostgreSQL
Create a Trigger CREATE OR REPLACE TRIGGER add_sms_retry_time BEFORE UPDATE ON public.sms_pool FOR EACH ROW EXECUTE PROCEDURE public.add_sms_try_time(); Define the Trigger Function CREATE OR REPLACE FUNCTION update_modified_column() RETURNS TRIGGER LANGUAGE PLPGSQL AS $$ BEGIN IF row(NEW.a2wackid) IS DISTINCT FROM row(OLD.a2wackid) THEN NEW.last_try = now()::TIMESTAMP; NEW.try_time = concat(OLD.try_time ,', ', to_char(now(), 'DD/MM/YY HH24:MI:SS')); NEW.retry = OLD.retry - 1; END IF; RETURN NEW; END; $$ Remove Trigger and Function DROP TRIGGER add_sms_retry_time ON sms_pool DROP FUNCTION add_sms_try_time() View the Function Body SELECT proname,prosrc FROM pg_proc WHERE proname= 'update_modified_column';