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  • Users: exys
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  1. exys

    Slow SELECT .. IN (singelton SELECT..) ?

    I would think the following two queries should be processed the same, but the first one takes over a second, while the second takes a few milliseconds. SELECT * FROM tblData WHERE idA IN (SELECT idB FROM tblIndex WHERE idC=1234); SELECT * FROM tblData WHERE idA = (SELECT idB FROM tblIndex...

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