newbie: how to return one iteration *per unique date (DAY!)* in a timestamp column?

Hi all I posted this on the PHP-db list, but it is sunday.. and with so little traffic today, perhaps no one will mind if I post this here too? (with hoped I'll get a quicker pointer?). I'm translating some code from another server-side language into PHP, and I need something that 'summarizes' results found from a MySQL SELECT. I.e. - $foundTrackingRows=mysql_query("SELECT... while ($TrackingRow = mysql_fetch_object($foundTrackingRows)) {... ..such that the while loop only loops *ONCE per unique _date_ found (regardless of the hour/min./sec.)* in my column which is of type TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP PRIMARY KEY For example, if I have column values like these: 2009-08-01 07:01:00 2009-07-30 18:16:37 2009-07-30 17:49:06 2009-07-27 17:35:52 2009-07-27 17:24:21 2009-07-27 17:23:03 ..then my while { loop would only fire 3 times. I do my RTFM; can someone just give me a good point in the right direction. Thanks! ------------ John Butler/(Govinda) govinda.webdnatalk@gmail.com