birghtyoursite » mysql http://www.brightyoursite.com/blog Bright your site Mon, 19 Dec 2011 09:39:57 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 delete specific column duplicate data in mysql http://www.brightyoursite.com/blog/2010/05/23/delete-specific-column-duplicate-data-in-mysql/ http://www.brightyoursite.com/blog/2010/05/23/delete-specific-column-duplicate-data-in-mysql/#comments Sun, 23 May 2010 17:09:29 +0000 admin http://www.brightyoursite.com/blog/?p=401 I have a mysql table site_visitor with vid(auto_increment),IP,page,visit_time… columns, the problem is many duplicate IP data in the table, only the IP column data is duplicated while the others like isp,visit_time… are not, i did much test and finally find a very simple way.

delete specific column duplicate data in mysql 

DELETE duplicate_rows.*
FROM site_visitor AS single_rows
   INNER JOIN site_visitor  AS duplicate_rows ON duplicate_rows.IP= single_rows.IP
      AND duplicate_rows.vid> single_rows.vid;

just run those mysql codes via phpmyadmin or via php query, you will see it’s a magic.

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