SQL查询 - 找出正确的结果

Question

大家好，我得到一个SQL查询，我只是不知道类，并想知道我可以得到一些帮助。这里的问题是：

显示“获胜成员列表”：谁与项目名称，项目值一起中标成员列表，以及该项目的中标金额。我的代码只显示价高了所有的人，而不是每一个成员的最高投标

以及表：

Member (username, lastName, firstName, title, address, city, postcode, country, 
    phoneBH, phoneAH, faxNumber, email, registrationDate, password, isBuyer, 
    isSeller)  
Item (itemNumber, itemName, itemDescription, itemValue, itemLocation, 
    categoryID, sellerUsername)  
Auction (auctionNumber, currency, startDateTime, endDateTime, shippingTerms, 
    startBidAmount, reserveAmount, bidIncrementAmount, noOfItems, itemSold, 
    itemNumber feedbackDateAndTime, rating, comments, paymentDate, paymentid)  
Bid (bidderUsername, auctionNumber, bidDateTime,bidAmount)    

SELECT B.bidderUsername, I.itemName, I.itemValue, B.bidAmount, A.auctionNumber   
FROM Item I, Auction A, Bid B   
WHERE A.auctionNumber = B.auctionNumber   
AND I.itemNumber = A.itemNumber   
AND B.bidAmount >= A.reserveAmount   
AND A.endDateTime < SYSDATE   
AND B.bidAmount = (SELECT max(B.bidAmount)       
FROM dbf12.Bid B, dbf12.Auction A       
WHERE B.auctionNumber = A.auctionNumber) 

的代码，你可能需要的表选择代码/表并推ctrl-k

Answer 1

我修好了。我在回答我的子查询中的表错误。 下面是正确的代码

SELECT B.bidderUsername, I.itemName, I.itemValue, B.bidAmount, A.auctionNumber 
FROM dbf12.Item I, dbf12.Auction A, dbf12.Bid B 
WHERE A.auctionNumber = B.auctionNumber 
AND I.itemNumber = A.itemNumber 
AND B.bidAmount >= A.reserveAmount 
AND A.endDateTime < SYSDATE 
AND B.bidAmount = (SELECT max(B.bidAmount) 
       FROM dbf12.Bid B 
      WHERE B.auctionNumber = A.auctionNumber);