Problem with different resultset with same data and same query in Oracle 8.1.7 and 9i

Question

Hello,
I have been using this query in oracle 8.1.7
SELECT
ID,
AREA_NO
FROM MANAGER_AREA MGR
WHERE COMPANY_ID = :id AND
(:value < (SELECT COUNT(ROWID)
FROM MANAGER_WORK MW
WHERE MW.AREA_ID = MGR.ID AND
(MW.END_WORK IS NULL OR MW.END_WORK >= SYSDATE)))
order by AREA_NO;
In the above query I want to see rows from MANAGER_AREA table depending upon date criteria in the table MANAGER_WORK and also upon the parameter :value i.e if I pass a value as 0 I get to see records for which their is atleast 1 record in MANAGER_WORK with the date criteria and if I pass -1 then I get all the records because minimum value that count(*) would give is 0. The resultset was as expected in 8.1.7.
A couple of days back I installed PERSONAL 9i to test for testing the basic functionality of our program with the same data. This query fails and irrespective whether I pass -1 or 0 it returns me same dataset which I would have got in case if I pass 0.
I do not know whether this is a bug that has got introduced in 9i. Can anybody help me with this problem. It would be difficult for me to change the parameter send to this query as the Query is called from many different places.
Thanks in advance
Amol.

Answer 1

I cannot use a Group by and a having statement over here. The problem with 'Group by' and 'having' clause is If I have to make a join between the two tables. When I use join then I get only rows that are linked to each other in the table.
If I use outer join to solve that problem then I have to take in consideration the other date condition. My previous query use to virtually discard the corelated query result by using -1 as the value. This will not happen in the join query.
Amol.