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Re: Index optimized left join with group by
Posted by: Øystein Grøvlen
Date: March 12, 2013 04:16AM

Hi Michal,

According to http://dev.mysql.com/doc/refman/5.6/en/loose-index-scan.html,
the Loose Index Scan optimization is only applicable when "The query is over a single table."

Hope this helps,

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

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