Hvad er der galt her?

SQL kode 

 SELECT from,to, TIMEDIFF(from,to) AS wt FROM work_schedule

SQL kode 

 CREATE TABLE IF NOT EXISTS `work_schedule` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `from` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   `to` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
   `payed` enum('0','1') COLLATE latin1_danish_ci NOT NULL,
   `user_id` int(11) NOT NULL,
   PRIMARY KEY (`id`)
 ) ENGINE=MyISAM  DEFAULT CHARSET=latin1 COLLATE=latin1_danish_ci AUTO_INCREMENT=3 ;