CREATE TRIGGER update_article_modtime BEFORE UPDATE ON article FOR EACH ROW WHEN (((((NOT (old.id_infoksiazka IS DISTINCT FROM new.id_infoksiazka)) AND (NOT (old.shoper_id IS DISTINCT FROM new.shoper_id))) AND (old.id_infoksiazka IS DISTINCT FROM new.id_infoksiazka)) AND (old.shoper_id IS DISTINCT FROM new.shoper_id))) EXECUTE PROCEDURE  update_modified_column();