How to hint hash join order on indexes ?

Question

Hi,
in my 9.2.0.8 DB I've got query like this:
SELECT COUNT (agreementno) cnt
FROM followup
WHERE agreementno = :v001 AND actioncode = :v002 AND resultcode = :v003;
Plan
SELECT STATEMENT  CHOOSECost: 11  Bytes: 18  Cardinality: 1                      
     5 SORT AGGREGATE  Bytes: 18  Cardinality: 1                 
          4 VIEW index$_join$_001 Cost: 11  Bytes: 18  Cardinality: 1            
               3 HASH JOIN  Bytes: 18  Cardinality: 1       
                    1 INDEX RANGE SCAN NON-UNIQUE IDX_FOLLOWUP06 Cost: 13  Bytes: 18  Cardinality: 1 
                    2 INDEX RANGE SCAN UNIQUE PK_FOLLOWUP Cost: 13  Bytes: 18  Cardinality: 1  I need to change join order of indexes, so the proble one would be PK_FOLLOWUP .
Of course the best plan is index range scan on pk but during to hight CF Oracle is combining 2 indexes .
Regards.
Greg

Answer 1

Hmm sorry for red-herring.
I guess you could also consider hand-coding the index join, something like:
SELECT /*+ ORDERED USE_HASH (b) */
       COUNT (a.empno)
FROM  (SELECT e.empno
       FROM emp e
       WHERE e.empno > 7000) a,
      (SELECT e.empno
       FROM emp e
       WHERE e.ename LIKE 'S%') b
WHERE  a.ROWID = b.ROWID;or...
WITH e AS
     (SELECT e.empno, e.ename
        FROM emp e)
SELECT /*+ ORDERED USE_HASH (b) */
       COUNT (a.empno)
FROM   e a, e b
WHERE  b.ename LIKE 'S%'
AND    a.empno > 7000
AND    a.ROWID = b.ROWID;