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SQL query causing timeout

 
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prasun dhara

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Joined: 01 Mar 2008
Posts: 49
Location: kolkata

PostPosted: Wed Mar 21, 2012 5:52 pm    Post subject: SQL query causing timeout
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Requiremnt :
Need to find out all the event no whose first 4 bytes are same but last 2 bytes are different

Table A
Code:
event no
123455
223455
223455
123456
672744
672746

Expected out put

Code:
123455
123456
672744
672746


We have written a query BUT THIS IS GETTING TIME OUT abend

Code:
SELECT DISTINCT A.EVN FROM DB2.TABLEA A                 
WHERE EXISTS                                               
   ( SELECT 1 FROM DB2.TABLEA B                           
     WHERE A.EVN BETWEEN B.EVN AND LEFT(B.EVN,4)||'99' 
       AND A.EVN > B.EVN)                                 
WITH UR;
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dbzTHEdinosauer

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Joined: 20 Oct 2006
Posts: 6968
Location: porcelain throne

PostPosted: Wed Mar 21, 2012 6:18 pm    Post subject:
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can't test, but:
Code:
SELECT A.EVN
FROM TABLE A
    ,TABLE B
WHERE LEFT(A.EVN,4) = LEFT(B.EVN,4)
  AND A.EVN <> B.EVN
GROUP BY A.EVN
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prasun dhara

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Joined: 01 Mar 2008
Posts: 49
Location: kolkata

PostPosted: Fri Mar 23, 2012 9:46 am    Post subject: Reply to: SQL query causing timeout
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Cost of query is even more for this.

Code:
SELECT A.EVN
FROM TABLE A
    ,TABLE B
WHERE LEFT(A.EVN,4) = LEFT(B.EVN,4)
  AND A.EVN <> B.EVN
GROUP BY A.EVN


Can you please suggest some other for which cost of query will be less other wise job will get ebended with timeout
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