SQL Re-Write....Using Exists?

Question

Hi Gurus, I need some help to tune the below query please. I am running it since morning and it is taking very long to return data, so i was wondering if there is a better way to write the query?
Basically, I just have to get the count of Policies in a table using:
1) A Subquery and
2) (i dont want to include some policies which meet a certain criteria)....
SELECT count( Distinct DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_ID)
FROM DBO.PERSONAL_AUTO_POLICY_PERIOD,dbo.personal_auto_policy_trans
WHERE
dbo.personal_auto_policy_trans.PLCY_PERIOD_ID = DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_PERIOD_ID
and
( DBO.PERSONAL_AUTO_POLICY_PERIOD.VERSION_ID =
Select max(b.VERSION_ID)
from DBO.PERSONAL_AUTO_POLICY_PERIOD b
where DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_PERIOD_ID = b.PLCY_PERIOD_ID
and (DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_STATUS_CD = 'A'
or b.PLCY_PERIOD_EFDT > 30 )))
and
DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_ID
not in (
SELECT (DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_ID)
FROM DBO.PERSONAL_AUTO_POLICY_PERIOD, dbo.personal_auto_policy_trans
WHERE
dbo.personal_auto_policy_trans.PLCY_PERIOD_ID = DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_PERIOD_ID
and
(DBO.PERSONAL_AUTO_POLICY_PERIOD.ORIGINAL_PLCY_EFDT = DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_EFDT)
Please Help, Any Ideas are greatly appreciated. Thanks.

Answer 1

I am just rewriting ur code to understand
SELECT count( Distinct DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_ID)
FROM DBO.PERSONAL_AUTO_POLICY_PERIOD,dbo.personal_auto_policy_trans
WHERE
dbo.personal_auto_policy_trans.PLCY_PERIOD_ID = DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_PERIOD_ID
and
( DBO.PERSONAL_AUTO_POLICY_PERIOD.VERSION_ID =
( Select max(b.VERSION_ID)
   from DBO.PERSONAL_AUTO_POLICY_PERIOD b
   where DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_PERIOD_ID = b.PLCY_PERIOD_ID
     and (DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_STATUS_CD = 'A'
       or b.PLCY_PERIOD_EFDT > 30 )
and
DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_ID
not in ( SELECT (DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_ID)
            FROM DBO.PERSONAL_AUTO_POLICY_PERIOD, dbo.personal_auto_policy_trans
            WHERE  dbo.personal_auto_policy_trans.PLCY_PERIOD_ID   =
                        DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_PERIOD_ID
             and
                      (DBO.PERSONAL_AUTO_POLICY_PERIOD.ORIGINAL_PLCY_EFDT =  
                        DBO.PERSONAL_AUTO_POLICY_PERIOD.PLCY_EFDT)
         )Edited by: user10647455 on Jan 5, 2009 3:01 PM