26

可以在where in子句中使用case吗？像这样的东西：

 DECLARE @Status VARCHAR(50);
 SET @Status='published';

 SELECT * FROM Product P    
 WHERE P.Status IN (CASE WHEN @Status='published' THEN (1,3)
                                   WHEN @Status='standby' THEN (2,5,9,6)
                                   WHEN @Status='deleted' THEN (4,5,8,10)
                                   ELSE (1,3)
                                   END)

此代码给出错误：“，”附近的语法不正确。

4

7 回答 7

37

不，你不能使用case和in喜欢这个。但你可以做

SELECT * FROM Product P    
WHERE @Status='published' and P.Status IN (1,3)
or @Status='standby' and P.Status IN  (2,5,9,6)
or @Status='deleted' and P.Status IN (4,5,8,10)
or P.Status IN (1,3)

顺便说一句，您可以将其减少到

SELECT * FROM Product P    
WHERE @Status='standby' and P.Status IN (2,5,9,6)
or @Status='deleted' and P.Status IN (4,5,8,10)
or P.Status IN (1,3)

因为or P.Status IN (1,3)也给你所有的记录@Status='published' and P.Status IN (1,3)

于 2013-10-09T12:26:45.927 回答
11

我意识到这已经得到解答，但是接受的解决方案存在一个小问题。它将返回误报。易于修复：

SELECT * FROM Products P    
WHERE (@Status='published' and P.Status IN (1,3))
   or (@Status='standby' and P.Status IN  (2,5,9,6))
   or (@Status='deleted' and P.Status IN (4,5,8,10))
   or (@Status not in ('published','standby','deleted') and P.Status IN (1,2))

不需要括号（尽管可能更容易阅读，因此我将它们包括在内）。

于 2013-10-09T12:43:36.083 回答
3

我相信您可以在 where 子句中使用 case 语句，这是我的做法：

Select 
ProductID
OrderNo,
OrderType,
OrderLineNo
From Order_Detail
Where ProductID in (
Select Case when (@Varibale1 != '') 
then (Select ProductID from Product P Where .......)
Else (Select ProductID from Product)
End as ProductID
)

这种方法一次又一次地对我有用。试试看！

于 2017-12-07T20:04:50.960 回答
1 
 SELECT  * FROM Tran_LibraryBooksTrans LBT  
 LEFT JOIN Tran_LibraryIssuedBooks LIB ON 
 CASE WHEN LBT.IssuedTo='SN' AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1
      WHEN LBT.IssuedTo='SM' AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1 
      WHEN LBT.IssuedTo='BO' AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1
 ELSE 0 END
于 2015-06-12T11:09:05.273 回答
1

也许你可以试试这种方式

SELECT * FROM Product P WHERE (CASE WHEN @Status = 'published' THEN (CASE WHEN P.Status IN (1, 3) THEN 'TRUE' ELSE FALSE END) WHEN @Status = 'standby' THEN (CASE WHEN P.Status IN (2, 5, 9, 6) THEN 'TRUE' ELSE 'FALSE' END) WHEN @Status = 'deleted' THEN (CASE WHEN P.Status IN (4, 5, 8, 10) THEN 'TRUE' ELSE 'FALSE' END) ELSE (CASE WHEN P.Status IN (1, 3) THEN 'TRUE' ELSE 'FALSE' END) END) = 'TRUE'

这样，如果@Status = 'published'，查询将检查 P.Status 是否在 1 或 3 之间，否则返回 TRUE 否则 'FALSE'。这将在最后与 TRUE 匹配

希望能帮助到你。

于 2016-06-28T04:31:34.783 回答
0 
 select  * from Tran_LibraryBooksTrans LBT  left join
 Tran_LibraryIssuedBooks LIB ON   case WHEN LBT.IssuedTo='SN' AND
 LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1 when LBT.IssuedTo='SM'
 AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1 WHEN
 LBT.IssuedTo='BO' AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1
 ELSE 0 END`enter code here`select  * from Tran_LibraryBooksTrans LBT 
 left join Tran_LibraryIssuedBooks LIB ON   case WHEN LBT.IssuedTo='SN'
 AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1 when
 LBT.IssuedTo='SM' AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN 1
 WHEN LBT.IssuedTo='BO' AND LBT.LIBRARYTRANSID=LIB.LIBRARYTRANSID THEN
 1 ELSE 0 END
于 2015-06-12T10:33:21.990 回答
0

根据我的场景，我确实“在 WHERE IN 子句中使用 CASE 语句”，如下所示

@AdjType varchar(20) = 'Value', 
@Base varchar(20) = 'Common'
where 
(select CASE WHEN SA.IsPersentage = 0 THEN 'Value' 
       WHEN SA.IsPersentage = 1 THEN 'Presentage' END) Like @AdjType
and (Select CASE WHEN SA.IsDependOnBasicSalary = 0 THEN 'Common' 
        WHEN SA.IsDependOnBasicSalary = 1 THEN 'Basic Salary' END) like @Base
于 2020-10-24T05:29:29.937 回答