There is a field \'noticeBy\' enum(\'email\',\'mobile\',\'all\',\'auto\',\'nothing\') NOT NULL DEFAULT \'auto\'. As it known ordering by ENUM field performs relative to its
This also works:
ORDER BY FIELD(noticeBy, 'all','auto','email','mobile','nothing')
(I don't believe that there is a setting to achieve this, you have to provide the sort-values.)