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SQL Query to achieve control break in result set

 
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prasun dhara

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Joined: 01 Mar 2008
Posts: 49
Location: kolkata

PostPosted: Tue May 24, 2011 12:43 pm    Post subject: SQL Query to achieve control break in result set
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Hi ,

I have a requirement like below :
Table A
Emp Id Role
1001 x
1001 y
1001 z
1002 c
1002 x
1003 a

I have to write a SQL query on this table to get a result like below

Counter Emp id Role
1 1001 x
2 1001 y
3 1001 z
1 1002 c
2 1002 x
1 1003 a


So I have to add a counter filed in the result set which will increament by one if the Emp id is same with previous one and the counter will re-set if the emp id changes.

Please note I have to do this by SQL query only and I am not allowed to write any COBOL logic

Thanks
Prasun
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GuyC

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Joined: 11 Aug 2009
Posts: 1281
Location: Belgium

PostPosted: Tue May 24, 2011 4:48 pm    Post subject:
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homework!?
I suggest you look up OLAP-function in a SQL-book.
=> row_number() & partition by
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prasun dhara

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Joined: 01 Mar 2008
Posts: 49
Location: kolkata

PostPosted: Tue May 24, 2011 5:21 pm    Post subject: Reply to: SQL Query to achieve control break in result set
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It's Not home work. It's a project work icon_biggrin.gif

I found a query with
"row_number() & partition by" nut not working


Are these (row_number() & partition by) supported for Db2 zOS v8 ?

This is part of a performance tuning project. we have to implement this logic in SPUFI instead of COBOL

Thanks for your help
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Pjoe

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Joined: 22 Jul 2005
Posts: 17

PostPosted: Tue May 24, 2011 7:04 pm    Post subject: Reply to: SQL Query to achieve control break in result set
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row_number is not available in DB2 v8 for z /os.
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dbzTHEdinosauer

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

PostPosted: Tue May 24, 2011 7:06 pm    Post subject:
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why do you need these sequence numbers?
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GuyC

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Joined: 11 Aug 2009
Posts: 1281
Location: Belgium

PostPosted: Tue May 24, 2011 7:32 pm    Post subject:
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trust me, implementing these sequence number in an sql pre v9 isn't performant :
Code:
SELECT
   (SELECT COUNT(*)
     FROM TableA s2
    WHERE s2.emp_id = s1.emp_id
      and s2.role <= s1.role) AS counter
   ,emp_id
   ,role
FROM TableA s1
ORDER BY s1.emp_id,role
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