Question

I have this SELECT query:

SELECT Auctions.ID, Users.Balance, Users.FreeBids, 
      COUNT(CASE WHEN Bids.Burned=0 AND Auctions.Closed=0 THEN 1 END) AS 'ActiveBids',
      COUNT(CASE WHEN Bids.Burned=1 AND Auctions.Closed=0 THEN 1 END) AS 'BurnedBids' 
FROM (Users INNER JOIN Bids ON Users.ID=Bids.BidderID) 
  INNER JOIN Auctions 
   ON Bids.AuctionID=Auctions.ID 
WHERE Users.ID=@UserID 
GROUP BY Users.Balance, Users.FreeBids, Auctions.ID

My problam is that it returns no rows if the UserID cant be found on the Bids table.

I know it’s something that has to do with my

(Users INNER JOIN Bids ON Users.ID=Bids.BidderID)

But i dont know how to make it return even if the user is no on the Bids table.

Answer 1

You’re doing an INNER JOIN, which only returns rows if there are results on both sides of the join. To get what you want, change your WHERE clause like this:

Users LEFT JOIN Bids ON Users.ID=Bids.BidderID

You may also have to change your SELECT statement to handle Bids.Burned being NULL.

If you want to return rows even if there’s no matching Auction, then you’ll have to make some deeper changes to your query.