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BETWEEN Versus > and < in DB2 SQL Query - Performance

 
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chinnielr

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Joined: 11 Jul 2005
Posts: 87

PostPosted: Thu Jul 10, 2008 1:14 pm    Post subject: BETWEEN Versus > and < in DB2 SQL Query - Performance
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Hi All,

I have the following querys:

SELECT ID, ADDRESS
FROM EMPLOYEE A
WHERE ID=12345
AND CURRENT DATE BETWEEN A.EFF_DT AND A.EXP_DT

SELECT ID, ADDRESS
FROM EMPLOYEE A
WHERE ID=12345
AND CURRENT DATE > A.EFF_DT AND CURRENT DATE < A.EXP_DT

Out of these two queries which query yields better performance.

Here I am using operators > and < instead of BETWEEN.

Please suggest.

Thanks,
Chinni.
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ashimer

Active Member


Joined: 13 Feb 2004
Posts: 551
Location: Bangalore

PostPosted: Thu Jul 10, 2008 2:59 pm    Post subject:
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Do an EXPLAIN on your query and see the o/p in PLAN_TABLE and DSN_STATEMNT_TABLE ...
BETWEEN is usually more efficient than <= predicate and the >= predicate
Except when comparing a host variable to 2 columns

I guess this concept was bought in DB2 versions after version 6 ... bfore that > and < used to perform better ... i read this in some blog by craigmullins ...
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dbzTHEdinosauer

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Joined: 20 Oct 2006
Posts: 6967
Location: porcelain throne

PostPosted: Thu Jul 10, 2008 3:12 pm    Post subject:
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Quote:

Out of these two queries which query yields better performance


Performance is not your worry, accuracy is.

BETWEEN, as ashimer said, is =< =>, NOT < and >.

so, you do not want to use between.
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