Find Unmatched Query Help

Question

Hello
We'd like to make a "find unmatched query" (similar to Microsoft Access); so, we created an outer join via Discoverer Administrator, and in Discoverer Desktop we tried to include a condition were only the rows with null value for a field in the outer joined table were shown.
The problem is that Discoverer also uses "(+)" for the null condition:
outerjoined_field(+) is null
This is why we are not getting the expected result.
Even if i import the sql withouth the (+) for the null condition, Discoverer adds the (+)
Is there a way to make a "find unmatched query"? (get all the information in table A where A.ID doesn't exist in B.ID)
Thanks in advance
More details:
1. Version: 9.0.2
2. Query generated by Discoverer:
SELECT COUNT(RTR_LKP_CLIENTE.ID_CLIENTE), COUNT(RTR_MAT_MAESTRO_POL_2.DES_POLIZA)
FROM RTR_ADMIN.RTR_LKP_CLIENTE RTR_LKP_CLIENTE, RTR_ADMIN.RTR_MAT_MAESTRO_POL_2 RTR_MAT_MAESTRO_POL_2
WHERE ( ( RTR_MAT_MAESTRO_POL_2.DES_POLIZA = RTR_LKP_CLIENTE.DES_POLIZA(+) ) ) AND ( RTR_LKP_CLIENTE.ID_CLIENTE(+) IS NULL ) AND ( RTR_MAT_MAESTRO_POL_2.DES_PREF_DIVISION = 'C1' )
3. Desired query:
SELECT COUNT(RTR_LKP_CLIENTE.ID_CLIENTE), COUNT(RTR_MAT_MAESTRO_POL_2.DES_POLIZA)
FROM RTR_ADMIN.RTR_LKP_CLIENTE RTR_LKP_CLIENTE, RTR_ADMIN.RTR_MAT_MAESTRO_POL_2 RTR_MAT_MAESTRO_POL_2
WHERE ( ( RTR_MAT_MAESTRO_POL_2.DES_POLIZA = RTR_LKP_CLIENTE.DES_POLIZA(+) ) ) AND ( RTR_LKP_CLIENTE.ID_CLIENTE IS NULL ) AND ( RTR_MAT_MAESTRO_POL_2.DES_PREF_DIVISION = 'C1' )

Answer 1

Ok, thank you very much
I didn't know that Discoverer used (+) only in some cases; using "field is null" is generated as "field (+) is null", but using OR is a good alternative, also using "field in (null)" worked fine, although i find it a little tricky.
Thanks again, bye