Rise of the PHX » boring code http://riseofthephx.com Web musings in the Valley of the Sun. Mon, 19 Jul 2010 18:29:49 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Find pesky duplicates in mysql http://riseofthephx.com/2009/12/14/find-pesky-duplicates-in-mysql/ http://riseofthephx.com/2009/12/14/find-pesky-duplicates-in-mysql/#comments Mon, 14 Dec 2009 17:00:23 +0000 gturnbul http://riseofthephx.com/?p=129 1; or search by first and last name: select concat(firstname,' ',lastname) as name, [...]]]> Let’s say you had an app that had a ton of users and were suspicious that there were pesky duplicates. Here is a quick mysql select to help put your mind at ease.


select username,count(*) as n
from users
group by username
having n > 1;

or search by first and last name:


select concat(firstname,' ',lastname) as name, count(*) as n
from users
group by name
having n > 1;

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