This trigger giving mutation error? any body can tell why?

Question

Hi All,
Could any body tell me where is the problem in my trigger.
my tables are.
1) EMP :- emp_id,emp_movement_status
2) EMPLOYEES_DAILY_MOVEMENT :- emp_id,transaction_time,transaction_remarks.
if i delete a entry from transactions_table, it has to take latest remarks from the maximum record after deletion of the record, then update EMP table accordingly.
trigger is:-
CREATE OR REPLACE TRIGGER change_employee_status AFTER INSERT OR UPDATE OR DELETE ON
employees_daily_movement FOR EACH ROW
DECLARE
local_remarks VARCHAR2(50);
BEGIN
IF DELETING THEN
SELECT transaction_remarks INTO local_remarks FROM employees_daily_movement WHERE
     transaction_id = (SELECT MAX(transaction_id) FROM employees_daily_movement WHERE
     emp_id = :old.emp_id );
/* here im expecting to take the TRANSACTION_REMARKS column value from employees_daily_movement after deleting the record which i wanted */
UPDATE emp SET emp_movement_status = local_remarks WHERE emp_id = :old.emp_id;
END IF;
END;
Thanks in advance

Answer 1

Hi Mr Rao,
You can handle muttating erros with following
1. Database version is oracle 9i and above, you can over come this problem for ever by using pragma autonomous_transaction.
2. Another way is, if you database version earlier to 9i then you can re-pharase this trigger by writting statement level trigger instead row level.
Cheers!!
Mahesh Ragineni