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Optimization with Between
Message
 
À
14/02/2007 12:49:04
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01195675
Message ID:
01196155
Vues:
9
Maybe you should stop whinning about documented optimization and figure out how to get your 23 year-old son to leave the nest!



>With index tags on Mem_dEffect and Mem_dExpire this is fully optimized:
>
>SELECT * FROM MEMBER WHERE MEMER.Mem_dEffect<=m.ldDate AND MEMBER.Mem_dExpire>=m.ldDate
>
>
>It would seem either of these two would be fully optimized.
>
>SELECT * FROM MEMBER WHERE m.ldDate BETWEEN MEMBER.Mem_dEffect AND MEMBER.Mem_dExpire
>
>SELECT * FROM MEMBER WHERE BETWEEW(m.ldDate, MEMBER.Mem_dEffect,MEMBER.Mem_dExpire)
>
>But with these optimization is only partial. Couldn’t you make the engine smart enough to figure this out and fully optimize it?
>
>Also
>
>SELECT * FROM MEMBER WHERE MEMBER.Mem_dExpire = {}
>is fully optimized
>but
>SELECT * FROM MEMBER WHERE EMPTY(MEMBER.Mem_dExpire)
>is not.
>
>
>Again, couldn’t you make the engine smart enough to figure this out and fully optimize it?
>
>
>Thanks,
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