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Re: Optimize subquery, replace IN() with JOIN
Posted by: Øystein Grøvlen
Date: November 16, 2016 01:50AM

Hi Miron,

In theory, MySQL should be able to automatically convert this query into a join (so-called semi-join transformation). Please, show the output of EXPLAIN for this query. (SHOW CREATE TABLE for each table would also help.)

Thanks,

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

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