CREATE TRIGGER YLA.UDANTRG3 
NO CASCADE BEFORE UPDATE ON YLA.BASE_TABLE REFERENCING OLD AS OLDROW 
            NEW AS NEWROW   
FOR EACH ROW MODE DB2SQL 
WHEN (          (OLDROW.DATA1 = NEWROW.DATA1)  
     )   
BEGIN ATOMIC   
SIGNAL SQLSTATE '75001' ('NO UPDATED DATA') ;   
END!