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Re: CONCAT and Index in where clause
Posted by: Øystein Grøvlen
Date: August 23, 2012 01:15AM


Indexes do not apply for expressions involving functions over columns. In your specific case, you should be able to use an index if you rewrite the query as follows:

SELECT * from MyTABLE WHERE YEAR='2012' and MONTH='08' and DAY='21';

Hope this helps,

Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway

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Written By
August 22, 2012 08:45AM
Re: CONCAT and Index in where clause
August 23, 2012 01:15AM
August 23, 2012 09:13PM

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