Question

是否可以在IN子句中包含多个字段？如下所示：

select * from user
where code, userType in ( select code, userType from userType )

我正在使用ms sql server 2008

我知道这可以通过连接和存在来实现，我只是想知道是否可以使用IN子句来完成。

Answer 1

不是你发布的方式。您只能返回单个字段或类型IN才能正常工作。

来自MSDN（IN）：

test_expression [ NOT ] IN 
    ( subquery | expression [ ,...n ]
    ) 

subquery - Is a subquery that has a result set of one column. 
           This column must have the same data type as test_expression.

expression[ ,... n ] - Is a list of expressions to test for a match. 
                       All expressions must be of the same type as 
                       test_expression.

而不是IN，您可以使用JOIN使用两个字段：

SELECT U.* 
FROM user U
  INNER JOIN userType UT
    ON U.code = UT.code
    AND U.userType = UT.userType

Answer 2

你可以使用这样的表格：

select * from user u
where exists (select 1 from userType ut
              where u.code = ut.code
                and u.userType = ut.userType)

Answer 3

只有可怕的东西，比如

select * from user
where (code + userType) in ( select code + userType from userType )

然后你必须管理空值和连接数字，而不是添加和转换，代码为12，用户类型为3，代码为1，用户类型为23，...

所以你去了：一个没有使用连接或存在的解决方案..以及为什么你不应该使用它的一些原因;）

Answer 4

相反如何：

SELECT user.* FROM user JOIN userType on user.code = userType.code AND user.userType = userType.userType

Answer 5

您可以使用联接

SELECT * FROM user U 
INNER JOIN userType UT on U.code = UT.code 
AND U.userType = UT.userType

Answer 6

我必须做一些非常相似的事情，但EXISTS在我的情况下不起作用。这对我有用：

UPDATE tempFinalTbl
SET BillStatus = 'Non-Compliant'
WHERE ENTCustomerNo IN ( SELECT DISTINCT CustNmbr
             FROM tempDetailTbl dtl
            WHERE dtl.[Billing Status] = 'NEEDS FURTHER REVIEW'
              AND dtl.CustNmbr = ENTCustomerNo 
              AND dtl.[Service] = [Service]) 
  AND [Service] IN  ( SELECT DISTINCT [Service] 
             FROM tempDetailTbl dtl
            WHERE dtl.[Billing Status] = 'NEEDS FURTHER REVIEW'
              AND dtl.CustNmbr = ENTCustomerNo 
              AND dtl.[Service] = [Service])

编辑：现在我看，这非常接近@ v1v3kn的回答

Answer 7

我不认为查询是非常便携的，使用像

这样的东西会更安全

select * from user
where code in ( select code from userType ) and userType in (select userType from userType)

Answer 8

select * from user
where (code, userType) in ( select code, userType from userType );

SQL Server - 包含多个字段的IN子句

8 个答案: