Re: Slow COUNT + GROUP BY
Hi,
The subquery variant will probably not use a duplication elimination technique. It will use a temporary table instead. Anyhow, I am not sure the duplicate elimination will show up as a separate stage in the profiling.
Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway
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Re: Slow COUNT + GROUP BY
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