Re: distinct clause issue for 600000 records
Hi,
I agree that IN-subqueries are better than DISTINCT. Avoiding duplicates in the first place will perform better than removing them afterwards. With MySQL 5.6 it should perform better, IN-subqueries should have better performance than before.
I still do not understand what cardinality length is.
Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway
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Re: distinct clause issue for 600000 records
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November 16, 2015 05:54AM