group by day

Can you help me with this query below Mgr's could circumvent the process by login 20 times in 1 day and change the login attempts. This is a rolling 30 window my upper mgmt would like to track. select user, count(user) as num from LoginTrack where user and t='M' and DATE_SUB(CURDATE(),INTERVAL 30 DAY) <=date group by user order by num desc"; I have a dilemma trying to combine the data below. The problem is that when users login several times a day I only want to count it a 1 login not 5 or more. I tried group by date and because the time is in the date that did not work. Any help would be appreciated !!! Ideally the data below should return mgrtft 1 mgrschultz 2 mgrreid 1 // MySql Table data below: varchar datetime char user date t mgrtft 2005-06-21 10:17:00 M mgrtft 2005-06-21 10:16:00 M mgrschultz 2005-06-21 09:12:00 M mgrschultz 2005-06-21 08:56:00 M mgrschultz 2005-06-21 08:26:00 M mgrreid 2005-06-21 08:26:00 M mgrschultz 2005-05-21 08:16:00 M mgrschultz 2005-06-21 08:07:00 M mgrtft 2005-06-21 07:46:00 M Larry Sandwick Sarreid, Ltd. www.sarreid.com Network/System Administrator P:(252) 291-1414 223 F:(252) 237-1592