Here is the trigger code, thanks.
CREATE OR REPLACE TRIGGER check_student_grp
BEFORE INSERT
ON course_activity FOR EACH ROW
DECLARE
v_vDPECError dpec_errors_table.error_description%TYPE;
v_nDPECErrorCode dpec_errors_table.error_code%TYPE;
v_vDPECAction dpec_errors_table.error_action%TYPE;
v_count NUMBER;
BEGIN
SELECT count(*)
INTO v_count
FROM student_grps s,hub h
WHERE s.stuid = :new.stuid
AND h.gid = s.gid;
IF v_count = 0 then
RAISE dpec_errors.STUDENT_GRP_INVALID;
END IF;
EXCEPTION
WHEN NO_DATA_FOUND THEN
dbms_output.put_line('***SHOULD NOT GET THIS***');
WHEN dpec_errors.STUDENT_GRP_INVALID THEN
dpec_errors.get_error('STUDENT_GRP_INVALID',v_nDPECErrorCode,v_vDPECError,v_
vDPECAction);
RAISE_APPLICATION_ERROR(v_nDPECErrorCode,v_vDPECError);
END;
/
-----Original Message-----
Sent: Tuesday, February 26, 2002 7:13 AM
To: Multiple recipients of list ORACLE-L
Can you post your trigger so we can see what else is happening? I do not
see where having the SELECT as you have posted to be of any use
in a trigger. I think in order to get a NO DATA FOUND error in a trigger
from SELECT COUNT(*)... would be if it was a cursor.
Rick
Viral Amin
<Viral.Amin@origin To: Multiple recipients of
list ORACLE-L <[EMAIL PROTECTED]>
india.com> cc:
Sent by: Subject: RE: SELECT
statement...
[EMAIL PROTECTED]
02/26/2002 04:33
AM
Please respond to
ORACLE-L
Hi,
Count(*) will never return NO_DATA_FOUND..so NULL value being compared is
out of question
Viral.
-----Original Message-----
Sent: Tuesday, February 26, 2002 1:28 PM
To: Multiple recipients of list ORACLE-L
Hi Rich,
I doubt any NULL value being checked in the WHERE CLAUSE...
as u will be knowing a NULL is not equal to another NULL.... in oracle !!
Just try applying NVL on such possible columns ....
Hope this may help u.
regards,
Arul.
Richard Huntley wrote:
> I'm encountering something very strange...has anyone ever encountered a
> simple select
> statement that found no data such as:
>
> SELECT COUNT(*)
> FROM student_grps s, grps g
> where s.stuid = :new_stuid
> and g.gid = s.gid;
>
> This code is inside a before insert row level trigger and the select
works
> fine
> at an SQL prompt but encounters a NO_DATA_FOUND exception when the
trigger
> fires.
> Any ideas at all?? How can count(*) encounter this??
>
> TIA,
> Rich
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> Author: Richard Huntley
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