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TUNE the query

 
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Ambili S

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Joined: 06 Sep 2007
Posts: 112
Location: India

PostPosted: Mon Sep 26, 2011 10:58 am    Post subject: TUNE the query
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Hi

Below is the query :

Select C1,C2 from T1,T2 where T1.C1 = T2.C1
and C3 < ( Select NEW_COL from T3 where T1.C1 = T3.C1)
and C9 >= ( Select NEW_COL from T3 where T1.C1 = T3.C1)
and C11 > ( Select NEW_COL from T3 where T1.C1 = T3.C1) ;

Here when the above query runs , Select for T3 executes thrice.

Is there any way to tune this as the same column value is being checkd against three colums.
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ashimer

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Joined: 13 Feb 2004
Posts: 551
Location: Bangalore

PostPosted: Mon Sep 26, 2011 12:58 pm    Post subject:
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Try
Code:

Select C1,C2 from T1,T2,T3
where T1.C1 = T2.C1
and T1.C1 = T3.C1
and C3 < T3.NEW_COL
and C9 >= T3.NEW_COL
and C11 > T3.NEW_COL ;
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Ambili S

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Joined: 06 Sep 2007
Posts: 112
Location: India

PostPosted: Mon Sep 26, 2011 2:18 pm    Post subject:
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Ashimer ,

This would give results from T3 table also. I do not want the data from T3.
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dbzTHEdinosauer

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

PostPosted: Mon Sep 26, 2011 2:39 pm    Post subject:
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Ambili S wrote:
Ashimer ,

This would give results from T3 table also. I do not want the data from T3.


god on a crutch.

Select t1.C1
,t1.C2
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