Rachel's Blog » MySQL http://www.willmer.com/kb Tue, 31 Aug 2010 08:48:54 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 checking for duplicates http://www.willmer.com/kb/2009/05/checking-for-duplicates/ http://www.willmer.com/kb/2009/05/checking-for-duplicates/#comments Fri, 08 May 2009 15:24:07 +0000 Rachel http://www.willmer.com/kb/2009/05/checking-for-duplicates/ 1; ]]> if for example, you want to apply a unique index, but you can’t because there’s duplicates in the table.

SELECT name FROM mytable GROUP BY name HAVING COUNT(*) > 1;

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