SQL 在 WHERE IN 子句中使用 CASE 語句

Question

是否可以在where in子句中使用case ？ 像這樣的東西：

 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)

此代碼給出了錯誤： ',' 附近的語法不正確。

Answer 1

不，你不能使用case ，並in這樣的。 但是你可以做

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)

順便說一句，您可以將其減少到

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)

因為or P.Status IN (1,3)還為您提供了@Status='published' and P.Status IN (1,3)所有記錄

Answer 2

我意識到這已經得到了回答，但是接受的解決方案存在一個小問題。 它將返回誤報。 易於修復：

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))

• SQL 小提琴演示

不需要括號（盡管可能更容易閱讀，因此我將它們包括在內）。

Answer 3

我相信您可以在 where 子句中使用 case 語句，這是我的做法：

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
)

這種方法一次又一次地對我有用。 試試吧！

Answer 4

 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

Answer 5

 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

Answer 6

也許你可以試試這種方式

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'

這樣，如果@Status = 'published'，查詢將檢查 P.Status 是否在 1 或 3 之間，否則返回 TRUE，否則返回 'FALSE'。 這將在最后與 TRUE 匹配

希望它有幫助。

Answer 7

根據我的場景，我確實“在 WHERE IN 子句中使用 CASE 語句”，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