Question

您好我想选择，每个与出价ID为'赢'的出价ID相关联的拍卖ID，以及每个拍卖ID，状态为'已过期'作为我声明中的两个单独列，有人可以帮忙，第一列将被叫赢，第二列将过期

SELECT 
      Auction.AuctionID, 
      DATENAME(mm, BID.Date) AS Month
FROM 
      BID INNER JOIN Auction ON BID.AuctionID = Auction.AuctionID
WHERE        
      BID.Status = 'Won'
ORDER BY Month

期望的结果：

AuctionID   Month                          Won  Expired
----------- ------------------------------ ---- -------
1           January                         32    22
2           March                           10    22
3           April                            0     2

Answer 1

你可以试试这样的东西吗，这不完全是一个概述

***

    SELECT 
          Auction.AuctionID, 
          DATENAME(mm, b1.Date) AS Month,
          COUNT(*) AS `Won`,
          (SELECT count(*) from BID b2 WHERE  DATENAME(mm, b1.Date) = DATENAME(mm, b2.Date))-COUNT(*) AS `EXPIRED` 
    FROM 
          BID b1
          INNER JOIN Auction ON BID.AuctionID = Auction.AuctionID       
    WHERE        
          BID.Status = 'Won' 
    GROUP BY Month

***

Answer 2

拍卖不能同时赢得并过期，因此您不需要例如：AuctionId 1：won：120214，过期050214？

好吧，让我们想象一下：

with p as (
   SELECT Auction.AuctionID, DATENAME(mm, BID.Date) AS Month
   FROM BID 
   INNER JOIN Auction ON BID.AuctionID = Auction.AuctionID)

select AuctionId, max(Won), Max(Expired)
from
(
   select AuctionId, Month as Won, null as Expired from p
   WHERE (BID.Status = 'Won')
   union
   select AuctionId, null, Month from p 
   WHERE (BID.Status = 'Expired')
) z
ORDER BY Won, Expired

Answer 3

如果你想要的结果是这样的：

AuctionID   Month                          Won  Expired
----------- ------------------------------ ---- -------
1           January                        Won  NULL
2           January                        Won  NULL
3           January                        NULL Expired

然后你可以使用这个查询：

SELECT        
    A.AuctionID, 
    DATENAME(mm, B.Date) AS Month, 
    CASE Status WHEN 'Won' THEN 'Won' ELSE NULL END AS Won, 
    CASE Status WHEN 'Expired' THEN 'Expired' ELSE NULL END AS Expired 
FROM BID b 
INNER JOIN Auction a ON B.AuctionID = A.AuctionID
ORDER BY Month, AuctionID

但如果你想要的结果是这样的：

AuctionID   Month                          Status
----------- ------------------------------ --------------------
1           January                        Won
2           February                       Won
3           January                        Expired

然后这个查询会：

SELECT        
    A.AuctionID, 
    DATENAME(mm, B.Date) AS Month, 
    Status
FROM BID b 
INNER JOIN Auction a ON B.AuctionID = A.AuctionID
ORDER BY Status Desc, Month DESC, AuctionID

第三次尝试。为了得到这个：

Month                          Won         Expired
------------------------------ ----------- -----------
January                        1           1
February                       1           0

使用此查询：

SELECT 
    DATENAME(mm, B.Date) AS Month, 
    SUM(CASE WHEN Status = 'Won' THEN 1 ELSE 0 END) AS Won,
    SUM(CASE WHEN Status = 'Expired' THEN 1 ELSE 0 END) AS Expired
FROM BID b 
INNER JOIN Auction a ON B.AuctionID = A.AuctionID
GROUP BY DATENAME(mm, B.Date), B.Date
ORDER BY b.Date

Answer 4

试试这个..

SELECT 
  Auction.AuctionID, 
  DATENAME(mm, BID.Date) AS Month,
  CASE status 
    WHEN Won THEN Status As Won
    WHEN Expired THEN Status As Expired
  END
FROM 
  BID INNER JOIN Auction ON BID.AuctionID = Auction.AuctionID
ORDER BY Month

从2表中选择2个不同的值

4 个答案: