Oracle Exists Bug

Question

All,
I have a doubt in the below sql Statement.
select *
FROM SISL_TXN_AGEING_TBL a
where
A.UNITHOLDERID = 'SBBNAC740162' AND
A.DATEALLOTED_REV BETWEEN :FD AND :ED
AND substr(A.txntype,1,2) ='03'
and a.UNITSCONFIRMED <> 0
and exists (select 'x' from BRKERAMENDMENTHISTORYTBL B where a.LINKTRANSACTIONNUMBER = B.TRANSACTIONNUMBER
and a.DATEALLOTED_REV between B.EFFECTIVEFROM and NVL(B.EFFECTIVETO,TRUNC(sysdate))
and B.TOBROKER = :BR
)  when i execute the query i am getting one row output.
But when i execute the below query i am getting no data found.
select *
FROM SISL_TXN_AGEING_TBL a
where
--A.UNITHOLDERID = 'SBBNAC740162' AND
A.DATEALLOTED_REV BETWEEN :FD AND :ED
AND substr(A.txntype,1,2) ='03'
and a.UNITSCONFIRMED <> 0
and exists (select 'x' from BRKERAMENDMENTHISTORYTBL B where a.LINKTRANSACTIONNUMBER = B.TRANSACTIONNUMBER
and a.DATEALLOTED_REV between B.EFFECTIVEFROM and NVL(B.EFFECTIVETO,TRUNC(sysdate))
and B.TOBROKER= :BR
)  I dont know the reason when i tried with below query again i am getting output.
select *
FROM SISL_TXN_AGEING_TBL a
where
A.UNITHOLDERID = 'SBBNAC740162' AND
A.DATEALLOTED_REV BETWEEN :FD AND :ED
AND substr(A.txntype,1,2) ='03'
and a.UNITSCONFIRMED <> 0
and exists (select 'x' from BRKERAMENDMENTHISTORYTBL B where a.LINKTRANSACTIONNUMBER = B.TRANSACTIONNUMBER
and TRIM(a.DATEALLOTED_REV) between B.EFFECTIVEFROM and NVL(B.EFFECTIVETO,TRUNC(sysdate))
and TRIM(B.TOBROKER) = :BR
)  Can anyone please advice where i am missing the logic.
Cheers,
San
Edited by: San on 7 Nov, 2012 10:09 PM

Answer 1

in your query ..
SELECT *
  FROM sisl_txn_ageing_tbl a
WHERE a.unitholderid = 'SBBNAC740162'
   AND a.datealloted_rev BETWEEN :fd AND :ed
   AND SUBSTR (a.txntype, 1, 2) = '03'
   AND a.unitsconfirmed   0
   AND EXISTS (
          SELECT 'x'
            FROM brkeramendmenthistorytbl b
           WHERE a.linktransactionnumber = b.transactionnumber
             AND a.datealloted_rev BETWEEN b.effectivefrom
                                       AND NVL (b.effectiveto,
                                                TRUNC (SYSDATE))
             AND b.tobroker = :br)  
   AND a.unitsconfirmed   0
should it be like
   AND a.unitsconfirmed   = 0regards ,
friend
Edited by: most wanted!!!! on Nov 8, 2012 10:44 PM