Update trigger syntax for multiple collumn update

Question

Hi
I would like to create an update trigger that updates 3 collumns in another table.
This works for one collumn:
CREATE OR REPLACE TRIGGER DBNAME.Update_EVENT
BEFORE UPDATE
ON DBNAME.DB_EVENTS
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
BEGIN
UPDATE DB_EVENT_LOG ELOG
SET
COMPLETION_EVENT = :NEW.COMPLETION_EVENT
     WHERE :OLD.RECORD_ID = ELOG.RECORD_ID ;
EXCEPTION
WHEN OTHERS THEN
-- log the error and re-raise
RAISE;
END ;
but this does not work for multiple collumns:
CREATE OR REPLACE TRIGGER DBNAME.Update_EVENT
BEFORE UPDATE
ON DBNAME.DB_EVENTS
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
BEGIN
UPDATE DB_EVENT_LOG ELOG
SET
(COMPLETION_EVENT
, COMPLETION_DT_TM
, COMPLETED_BY)
=
(:NEW.COMPLETION_EVENT
, :NEW.COMPLETION_DT_TM
, :NEW.COMPLETED_BY)
     WHERE :OLD.RECORD_ID = ELOG.RECORD_ID ;
EXCEPTION
WHEN OTHERS THEN
-- log the error and re-raise
RAISE;
END ;
What am i doing wrong?

Answer 1

Try selecting from DUAL:
SQL> CREATE TABLE emp_test AS SELECT * FROM emp
Table created.
SQL> CREATE OR REPLACE TRIGGER emp_trg
   AFTER UPDATE
   ON emp
   FOR EACH ROW
BEGIN
   UPDATE emp_test
      SET (sal, comm) = (SELECT :NEW.sal,
                                :NEW.comm
                           FROM DUAL)
    WHERE empno = :NEW.empno;
END;
Trigger created.
SQL> UPDATE emp
   SET sal = 5000,
       comm = 5000
WHERE empno = 7369
1 row updated.
SQL> SELECT empno,
       sal,
       comm
  FROM emp_test
WHERE empno = 7369
     EMPNO        SAL       COMM
      7369       5000       5000