ORA-01799: a column may not be outer-joined to a subquery

Question

Here is my query

SELECT 
    COUNT(C.SETID)
FROM 
    MYCUSTOMER C
    LEFT OUTER JOIN MYCUSTOPTION CO 
    ON 
        (C.SETID = CO.SETID 
            AND          


        

Answer 1

After trying those LEFT OUTER JOIN from the others answers, it works but it is really slow...

Best solution, in my own, is creating a VIEW related to the latest record you need and perform the left join on it.

CREATE VIEW VIEW_SOF_TOF as
SELECT SOF."FIELDA1", TOF."FIELDB1", TOF."FIELDB2", ...
FROM SOF, TOF
WHERE FIELDA1 (+) = FIELDB1
  AND ( FIELDB2 = (SELECT MAX(FIELDB2) FROM TOF WHERE FIELDA1 = FIELDB1)
    OR FIELDB2 IS NULL)