-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 He meant the execution order, please use the agregation function as suggested.
On 11-01-17 05:03, Jørn Dahl-Stamnes wrote: > On Monday 17 January 2011 09:53, Steve Meyers wrote: >> On 1/16/11 5:22 AM, Jørn Dahl-Stamnes wrote: >>> mysql> select album_id, updated_at, created_at from album_stats group by >>> album_id order by updated_at desc limit 8; >> >> I believe that your problem is that the group by happens before the >> order by. Since you're grouping, the updated_at column is not >> deterministic. If there are multiple rows per album_id, any one of >> those rows could provide the updated_at column that you're then using to >> order by. What you probably want is to select (and order by) the >> max(updated_at). > > moving the "group by" to after "order by" will result in an error: > > mysql> select album_id, updated_at, created_at from album_stats order by > updated_at group by album_id desc limit 8; > ERROR 1064 (42000): You have an error in your SQL syntax; check the manual > that corresponds to your MySQL server version for the right syntax to use > near 'group by album_id desc limit 8' at line 1 > > Beside, since I'm using Propel and Creole for ORM and database abstraction, I > would never be able to change the order of them. > -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJNNHQIAAoJENgwSj9ZOOwrR9UH/RDLojUwXYB1a+fcS0kuwzFW AZ/VdwknydB5ENkt7+MmWgHdVcPwrChE+nY2bpRI9LYp8ehUNwaeC2uV/ToWXFti ZTnVdnFDanHy20UOF3a1X7UXW89/zTy/B06X7NP1NqmIGnAahPK6VBuIx1OP/oGZ +es+m9BIYnuc8JzfRo5YSQuydfWIJ87ygrkodhM/C2VPBWDMwpEX/wuxgW/x+ukM RXKaxHrHOrWc1hWLFp3P+QI+J7VNP1fh6Rxw1Q91latJkY4I3hbN9nEsXeHlD2l2 f5ZNn4LwPPNC++XpGaDqQmA0W2Sua9lHUhtVsxsJt5kIigAwNJ5GnaayY/p9apk= =7MLg -----END PGP SIGNATURE----- -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
