I'm interested to see what kind of solution is offered for this as I could use it myself. I'm having to do this programatically on an expternal script that selects distinct non_unique_id and the takes the result and loops through each one with sort by endtime desc limit 1 and then either do something with the result during the loop or simply create a seperate temp table to store them in. Not the most efficient if there is a way to get it as a query though.
-----Original Message----- From: Jim Matzdorff [mailto:[EMAIL PROTECTED] Sent: Monday, October 27, 2003 4:37 PM To: [EMAIL PROTECTED] Subject: I can't figure out what I thought would be a simple query.. All; I am having tremendous trouble attempting to do the following query; and any help would be appreciated. I am using Mysql 4.0.15a; and I cannot upgrade. Given the following TEMPORARY table (it's a table I have created from a whole host of sources): table: endtime_table +---------------------+-----------------+---------------+ | endtime | need_id | non_unique_id | +---------------------+-----------------+---------------+ | 2003-08-17 00:46:59 | 18724 | 6646 | | 2003-08-17 00:46:59 | 18724 | 6647 | | 2003-08-17 00:46:59 | 18724 | 6648 | | 2003-08-17 00:46:59 | 18724 | 6649 | | 2003-08-17 00:46:59 | 18724 | 6650 | | 2003-08-17 00:46:59 | 18724 | 6651 | | 2003-08-17 00:46:59 | 18724 | 6652 | | 2003-08-17 00:46:59 | 18724 | 6653 | | 2003-08-18 00:20:10 | 19143 | 6646 | | 2003-08-18 00:20:10 | 19143 | 6647 | | 2003-08-18 00:20:10 | 19143 | 6648 | | 2003-08-18 00:20:10 | 19143 | 6649 | | 2003-08-18 00:20:10 | 19143 | 6650 | | 2003-08-18 00:20:10 | 19143 | 6651 | | 2003-08-22 00:02:10 | 17512 | 6646 | | 2003-08-18 00:20:10 | 19143 | 6652 | | 2003-08-18 00:20:10 | 19143 | 6653 | | 2003-08-23 00:11:10 | 14443 | 6650 | I would like, for each UNIQUE "non_unique_id"; to get the latest "endtime" for that unique ID. for instance; the result set I am looking for above would be: | 2003-08-22 00:02:10 | 17512 | 6646 | | 2003-08-18 00:20:10 | 19143 | 6647 | | 2003-08-18 00:20:10 | 19143 | 6648 | | 2003-08-18 00:20:10 | 19143 | 6649 | | 2003-08-23 00:11:10 | 14443 | 6650 | | 2003-08-18 00:20:10 | 19143 | 6651 | | 2003-08-18 00:20:10 | 19143 | 6652 | | 2003-08-18 00:20:10 | 19143 | 6653 | as you can see, there are 3 records for 6646 "non_unique_id" column; but the latest one is the date "2003-08-22 00:02:10" which has the "need_id" of 17512. and so forth. For the life of me, i can't figure out how to do this. i've tried various max(), group_by's, and such, but nothing has worked so far. either it can't be done (doubtful) or my brain can't figure it out (probable). short of doing something rediculous like invividual selects for each unique "non_unique_id"; is there a way i am missing? I hope? Thanks, --jim -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
