a problem when I create a trigger procedure.

[hyunkichung]

Hi,

I have been tesing a trigger procedure.
I'd like to know how i can assgign the return value of the aggregation fuction to a user-defined variable.
I have an example below. I'm trying to get st_count to have a retun value of the count(id). However, when i tested, the assignment didn't perform correctly. and the update opeartion didn't work.

I guess there is a type mismatch problem or something else. st_count is integer type and the retun value of the count() is biginteger type. Am I wrong?
Please advise me.


....
declare
st_count integer;
begin
st_count = (select count(id) from ENROLLMENT
WHERE CrsCode = NEW.CrsCode
AND SectionNo = NEW.SectionNo));

UPDATE OFFERED_CLASSES SET ENROLLMENT = ST_COUNT
WHERE CrsCode = NEW.CrsCode
AND SectionNumber = NEW.SectionNumber;
-- RETURN NULL;
end;
....