Question

我有两个表拳头一个客户和第二个Orderdetails。我希望从病房第4位开始注册，并排除已购买的客户名单。

    SELECT *
FROM Customer
WHERE RegisteredDate BETWEEN CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/04/2015',101)) 
                         AND CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/07/2015',101)) 
 AND CustomerID NOT IN(SELECT *
                       FROM Customer c
                       INNER JOIN orderdetails od ON c.CustomerId = od.CustomerID
                       WHERE C.RegisteredDate 
                     BETWEEN CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/04/2015',101)) 
                         AND CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/07/2015',101)) 
                         AND Transactionid IS NOT NULL
                       )

结果是：

Msg 116，Level 16，State 1，Line 13只有一个表达式在未引入子查询时在选择列表中指定存在。

Answer 1

删除子查询中的*（所有列），并在子查询中指定select CustomerID而不是*（所有列）。

因为当使用 NOT IN 时，预期子查询返回的列数只有一个。

Answer 2

正如其他答案中所提到的，IN运算符只需要在与子查询一起使用时返回一列，您应该只在子查询中选择cutomerID，但如果它有可能返回NULL值，那么使用EXISTS运算符就像....

SELECT *
FROM Customer c1
WHERE RegisteredDate BETWEEN CONVERT(DATETIME,'12/04/2015',101) 
                         AND CONVERT(DATETIME,'12/07/2015',101) 
AND NOT EXISTS (SELECT *
               FROM Customer c
               INNER JOIN orderdetails od ON c.CustomerId = od.CustomerID
               WHERE C.RegisteredDate 
             BETWEEN CONVERT(DATETIME,'12/04/2015',101) 
                 AND CONVERT(DATETIME,'12/07/2015',101) 
                 AND Transactionid IS NOT NULL
                 AND C1.CustomerID = c.CustomerID 
               )

Answer 3

您无法在子查询中使用select *，您需要指定在这种情况下为customerid的列。

SELECT *
FROM Customer
WHERE RegisteredDate BETWEEN CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/04/2015',101)) 
                     AND CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/07/2015',101)) 
AND CustomerID NOT IN(SELECT c.CustomerID
                   FROM Customer c
                   INNER JOIN orderdetails od ON c.CustomerId = od.CustomerID
                   WHERE C.RegisteredDate 
                 BETWEEN CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/04/2015',101)) 
                     AND CONVERT(DATETIME,CONVERT(VARCHAR(50),'12/07/2015',101)) 
                     AND Transactionid IS NOT NULL
                   )

Un Ordered Customer

3 个答案: