If you don't mind using a (quite useful) postgres extension, this might work for you:
select distinct on (auctions.id, users.id) * from auctions, bids, users where <join clauses> order by auctions.id, users.id, created_at desc; Hope this helps, On Fri, Jun 30, 2006 at 04:13:12PM +0100, Alan Bullock wrote: > hi all, I have the following schema: > > CREATE TABLE auctions ( id serial NOT NULL, user_id int4, title > varchar(255), body varchar(255), CONSTRAINT auctions_pkey PRIMARY KEY (id) ) > WITHOUT OIDS; > > CREATE TABLE bids ( id serial NOT NULL, auction_id int4, user_id int4, > amount float8, created_at timestamp, CONSTRAINT bids_pkey PRIMARY KEY (id) ) > WITHOUT OIDS; > > CREATE TABLE users ( id serial NOT NULL, username varchar(255), CONSTRAINT > users_pkey PRIMARY KEY (id) ) WITHOUT OIDS; > > I'd like to return all the bids for a given auction, but limit it to only > the *latest* bid from each user. so regardless of how many bids a user has > placed, only their latest is returned. > > I dont have a clue where to even start with this and would appreciate some > pointers > thanks > > alan > > > > > ---------------------------(end of broadcast)--------------------------- > TIP 1: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to [EMAIL PROTECTED] so that your > message can get through to the mailing list cleanly -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to > litigate.
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