Results 1 to 11 of 11
Thread: MySQL GROUP BY problem
Jul 24, 2009, 05:43 #1
- Join Date
- Jul 2009
- 0 Post(s)
- 0 Thread(s)
MySQL GROUP BY problem
I'm using MySQL with ASP pages. I'm building an auction style site and I want to show a member a list of their active bids. Because then can bid more than once for an "lot" I only want to show their highest bid for each "lot" - so, for instance if the bid (for one LOT) £50, then £75.00, then £100.00 it would only show the £100.00 bid.
The member can bid on many different "lots" so the list I want will show the "sale name", the sale "closing date", the "LOT number", their "bid", their "bid date" and a status message about whether they're the highest bidder or not.
My problem is that I can easily build the list to show "ALL" their bids and sort/order that list but it will include all the bods they've made for a particular "LOT" not just their highest bid.
I tried using DISTINCT on the bidlotId (the unique identifier for each lot in the bids table) but that didn't make any difference.
I then tried using GROUP BY bidlotId which does only show one bid for each lot but unfornately it's not the highest bid.
I need to figure out how to order/sort the GROUP BY function to show the highest bid for each lot.
This is my SQL:
"SELECT bidId, bidlotId, bidvalue, biddatetime, saleId, salename, saleclosingdate, lotnum, lotreserve FROM dbname.tblbids, dbname.tblsales, dbname.tbllots WHERE bidcustId = ? AND bidsaleId = saleId AND saleclosingdate > Now() AND bidlotId = lotId GROUP BY bidlotId ORDER BY saleclosingdate ASC, bidvalue DESC"
Many thanks in advance.