A simple way to do this is to truncate the date and then GROUP BY it. So if you have 2009-08-08, and you want a subset on month, then just truncate the day-part: 2009-08-00 on the whole column, and SELECT DISTINCT so you have a subset. You can use this subset then to join the dates, GROUP BY and aggregate....
An other way I found is described in Celko's 'SQL for smarties'. He uses modulo there. It seems powerful, but also tricky to implement for dates. I was wondering if anyone knew some other way to create a subset of a timestamp column. Any input is welcome. Regards, Davor -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
