SISI - QMO - Trigger

CREATE OR REPLACE TRIGGER MSO.M_AREA_TRG BEFORE INSERT ON MSO.M_AREA REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW
BEGIN
  <<COLUMN_SEQUENCES>>
  BEGIN
    IF INSERTING AND :NEW.ID_AREA IS NULL THEN
      SELECT M_AREA_SEQ.NEXTVAL INTO :NEW.ID_AREA FROM SYS.DUAL;
    END IF;
  END COLUMN_SEQUENCES;
END;