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Message Posted: Wed, 21 Feb 2007 @ 18:29:08 GMT


     
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Subj:   Avoid the Product Join
 
From:   Castelli Emanuel Alejandro

Hi all....

I need your help to try to avoid a Product Join in this query:

     select
     sum (case when b.range = 1 then 1 else 0 end),
     sum (case when b.range = 2 then 1 else 0 end),
     sum (case when b.range = 3 then 1 else 0 end)
     from
     table_a as a,
     table_b as b
     where
     a.duration between b.min_duration and b.max_duration;

The tables:

     table_a (duration is not part of the index)
     table_b (primary index: range, min_duration, max_duration)

Any ideas?


Thanks

Castelli, Emanuel Alejandro
Desarrollo DataWarehouse - IBM Argentina



     
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