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Need help on oracle sql query

digs developer
on
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Last Modified: 2014-08-18
SELECT  A.NO, G.ID
    FROM ABC A, DEF D, GHI G
   WHERE A.SYSTEM_CODE = 'AAA'
     AND A.SYSTEM_ID =  TO_CHAR(D.BID)
     AND D.CATID = G.CATID
     AND NOT EXISTS (SELECT 1
                       FROM XYZ
                      WHERE NO = A. NO
                        AND ID = G.ID);
--
From below query data is not coming.  
But when we pass the hard code value in BID then data is coming propery.  
Even if we remove the NOT then also give tha data properly. But when we checking NOT EXISTS then no rows selected.                  

 SELECT  A.NO, G.ID
    FROM ABC A, DEF D, GHI G
   WHERE A.SYSTEM_CODE = 'AAA'
     AND A.SYSTEM_ID =  '111'  --TO_CHAR(D.BID)
     AND D.CATID = G.CATID
     AND NOT EXISTS (SELECT 1
                       FROM XYZ
                      WHERE NO = A. NO
                        AND ID = G.ID);

I dont want to give hard code value.
Please give me  the solution .
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