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
Hmm... No foreign key constraints?
I think you're looking for something like:
SELECT *
FROM bids
WHERE auction_id = 1234
GROUP BY user_id
HAVING created_at = MAX(created_at);
You could also use a subselect with an order by created_at DESC limit 1
over each users bids.
Regards,
--
Alban Hertroys
[EMAIL PROTECTED]
magproductions b.v.
T: ++31(0)534346874
F: ++31(0)534346876
M:
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7500 AK Enschede
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