Re: Select [...] In (Select [...])
First, in MySQL, semi-joins like In(Select...) perform poorly. Use Joins instead. Second a Join on like '%Something%' can't use indexes, so it will be slow. An equi-join will perform better. If that's not possible, at least try to get rid of the leading wildcard.
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February 02, 2015 08:12AM
Re: Select [...] In (Select [...])
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February 02, 2015 11:46AM
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February 03, 2015 11:12AM
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