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
Subject
Views
Written By
Posted
1879
November 10, 2015 08:57AM
1022
November 11, 2015 12:33PM
873
November 12, 2015 12:49AM
1024
November 12, 2015 03:20AM
928
November 12, 2015 07:24PM
1096
November 12, 2015 07:08AM
962
November 12, 2015 07:18AM
954
November 12, 2015 07:43AM
1033
November 13, 2015 12:37AM
954
November 13, 2015 12:45AM
1004
November 13, 2015 02:42AM
1018
November 13, 2015 05:56AM
1005
November 13, 2015 06:38AM
1094
November 13, 2015 07:15AM
1058
November 13, 2015 08:11AM
1007
November 13, 2015 11:35AM
1083
November 16, 2015 03:04AM
1014
November 16, 2015 04:12AM
Re: distinct clause issue for 600000 records
943
November 16, 2015 05:54AM