Question

会员表每年每个成员包含1条记录（本例简化。

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我想要那些没有续约2014年的2013年会员。这就像我逻辑上来的那样接近但我的结果是空的

SELECT  Users.UserID
      , YEAR(Membership.MemYear) AS MemYear
      , Users.MailTo
      , Users.StreetAddress
      , Users.Address2
      , Users.City
      , StateLookup.State
      , Users.Zip
FROM Users INNER JOIN Membership 
ON Users.UserID = Membership.UserID 
INNER JOIN StateLookup 
ON Users.StateID = StateLookup.StateID 
where YEAR(Membership.MemYear) = '2013' 
and not exists 
(SELECT  Users.UserID, YEAR(Membership.MemYear) AS MemYear
       , Users.MailTo, Users.StreetAddress, Users.Address2
       , Users.City, StateLookup.State, Users.Zip
FROM Users INNER JOIN Membership AS Membership_1 
ON Users.UserID = Membership_1.UserID 
INNER JOIN StateLookup 
ON Users.StateID = StateLookup.StateID 
where YEAR(Membership_1.MemYear)='2014')

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Answer 1

我认为如果'UserID'是唯一的，你可以这样做。

SELECT Users.UserID  
  , YEAR(Membership.MemYear) AS MemYear  
  , Users.MailTo  
  , Users.StreetAddress  
  , Users.Address2  
  , Users.City  
  , StateLookup.State 
  , Users.Zip  
 FROM Users INNER JOIN Membership   
 ON Users.UserID = Membership.UserID   
 INNER JOIN StateLookup   
 ON Users.StateID = StateLookup.StateID   
 WHERE Membership.MemYear = '2013'   
 AND Users.UserID NOT IN  
   (SELECT UserID FROM Membership WHERE MemYear = '2014');

Answer 2

您可以使用MAX(MemYear)查找2013年最长纪念日的人。这意味着他们在2013年有效并且尚未续订。

SELECT Users.UserID
      , Users.MailTo
      , Users.StreetAddress
      , Users.Address2
      , Users.City
      , StateLookup.State
      , Users.Zip
FROM Users 
INNER JOIN Membership 
    ON Users.UserID = Membership.UserID 
INNER JOIN StateLookup 
    ON Users.StateID = StateLookup.StateID 
GROUP BY Users.UserID
      , Users.MailTo
      , Users.StreetAddress
      , Users.Address2
      , Users.City
      , StateLookup.State
      , Users.Zip
HAVING MAX(YEAR(Membership.MemYear)) = 2013

Answer 3

尝试按如下方式更改查询的底部：

您忘记引用回查询的其他图层。假设你的查询的其余部分没问题，这应该可以解决这个问题。

SELECT Users.UserID,
       YEAR(Membership.MemYear) AS MemYear,
       Users.MailTo,
       Users.StreetAddress,
       Users.Address2,
       Users.City,
       StateLookup.State,
       Users.Zip
  FROM Users
 INNER JOIN Membership
    ON Users.UserID = Membership.UserID
 INNER JOIN StateLookup
    ON Users.StateID = StateLookup.StateID
 where YEAR(Membership.MemYear) = '2013'
   and not exists (SELECT x.UserID,
               YEAR(Membership.MemYear) AS MemYear,
               x.MailTo,
               x.StreetAddress,
               x.Address2,
               x.City,
               StateLookup.State,
               x.Zip
          FROM Users x
         INNER JOIN Membership AS Membership_1
            ON x.UserID = Membership_1.UserID
         INNER JOIN StateLookup
            ON x.StateID = StateLookup.StateID
         where YEAR(Membership_1.MemYear) = '2014'
           and x.UserID = Users.UserID)

Answer 4

SELECT  Users.UserID
      , MemYear 
      , Users.MailTo
      , Users.StreetAddress
      , Users.Address2
      , Users.City
      , StateLookup.State
      , Users.Zip
FROM Users INNER JOIN Membership 
ON Users.UserID = Membership.UserID 
INNER JOIN StateLookup 
ON Users.StateID = StateLookup.StateID 
where Users.UserID  NOT IN 
                      (SELECT UserID
                       FROM Membership
                       where MemYear ='2014')

Answer 5

SELECT  Users.UserID
  , YEAR(Membership.MemYear) AS MemYear
  , Users.MailTo
  , Users.StreetAddress
  , Users.Address2
  , Users.City
  , StateLookup.State
  , Users.Zip
FROM Users INNER JOIN Membership ON Users.UserID = Membership.UserID 
INNER JOIN StateLookup ON Users.StateID = StateLookup.StateID 
where YEAR(Membership.MemYear) <= 2013   /* If it Integer you don't need '' */

为什么要使用子查询？

找到当年未续签的会员

5 个答案: