Dave's Occasional Brainfart » MySQL http://blog.kayosdesign.com Just another WordPress weblog Tue, 31 Jan 2012 02:26:27 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 MySQL ErrorNo 121 http://blog.kayosdesign.com/2009/12/29/mysql-errorno-121/ http://blog.kayosdesign.com/2009/12/29/mysql-errorno-121/#comments Tue, 29 Dec 2009 11:39:05 +0000 Dave http://blog.kayosdesign.com/?p=105 MySQL has a helpful error “Can’t create table (errno: 121)” which doesn’t seem to be documented anywhere except in forums.

Turns out this error is caused by InnoDB tables throwing an error when it detects duplicate foreign key names.

Basically, every foreign key has to have a unique name for InnoDB to function correctly.

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