Database trigger problem

Question

db 10g rel2 ,
i am trying to write this trigger :
{code}
CREATE OR REPLACE TRIGGER secure_emp
   BEFORE
   INSERT OR UPDATE OR DELETE
   ON emp
  BEGIN
   IF (TO_CHAR(SYSDATE,'DAY') IN ('thursday','friday')) OR
    (TO_CHAR(SYSDATE,'HH24:MI')  NOT BETWEEN '08:00' AND '18:00') THEN
    IF DELETING THEN RAISE_APPLICATION_ERROR(
     -20502,'You may delete from EMPLOYEES table only during business hours.');
   ELSIF INSERTING THEN RAISE_APPLICATION_ERROR(
    -20500,'You may insert into EMPLOYEES table only during business hours.');
   ELSIF UPDATING('SAL') THEN
   RAISE_APPLICATION_ERROR(-20503, 'You may update SALARY only during    business hours.');
   ELSE
   RAISE_APPLICATION_ERROR(-20504,'You may update EMPLOYEES table  during  normal hours.');
    END IF;
    END IF;
    END;
the result of the trigger is , inserting a record although the day is thursday ??
{code}
why does this happens ?
thanks

Answer 1

BluShadow wrote:
Or even better, use a suitable format mask on the TO_CHAR to remove trailing spaces...
This will not resolve NLS issues. For example, client in Germany will not get right result. OP should also use TO_CHAR third parameter:
SQL> alter session set nls_language=german
  2  /
Session altered.
SQL> select 'Yes' from dual where to_char(sysdate,'fmDAY') in ('THURSDAY','FRIDAY')
  2  /
no rows selected
SQL> select 'Yes' from dual where to_char(sysdate,'fmDAY','nls_date_language=english') in ('THURSDAY','FRIDAY')
  2  /
'YE
Yes
SQL>
SY.