http://dev.mysql.com/doc/refman/5.0/...functions.html

è molto interessante il commento di un utente, in fondo alla pagina:

Posted by Sascha René Leib on October 10 2002 1:29am

Also, keep in mind that by default,
Swedish/Finnish string comparison rules are in
use! This means that e.g.: u <> ü = y !