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Message Posted: Wed, 28 Apr 2004 @ 17:51:30 GMT


     
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Subj:   Re: Conditional max
 
From:   Hough, David A

I think the solution by Donald Maxwell:

     SELECT
             ,PARENT
             ,CHILD
             ,AMT
     FROM    SomeTable
     QUALIFY SUM(1) OVER ( PARTITION BY PARENT
             ORDER BY AMT desc, CHILD desc ROWS UNBOUNDED PRECEDING ) = 1;

Can be improved somewhat by replacing SUM with RANK:

     SELECT
              PARENT
             ,CHILD
             ,AMT
     FROM    SomeTable
     QUALIFY RANK() OVER ( PARTITION BY PARENT
                           ORDER BY AMT desc, CHILD desc) = 1;

Not that I would have found his original on my own... ;)


/dave hough



     
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