Question

我可以在SQL Server 2005的HAVING子句中有一个case语句吗？

以下是我的HAVING声明。它给了我一个语法错误。

@CLIENTPK_NEW IS NULL OR 
    (
        CLIENT.OH_PK = @CLIENTPK_NEW and 
        CASE WHEN @RelatedOrgs <> '11' then CLIENT.OH_PK= @CLIENTPK_NEW
        ELSE CLIENT.OH_PK in (
            SELECT dbo.OrgHeader.OH_PK FROM dbo.OrgHeader WITH (NOLOCK) INNER JOIN
            dbo.OrgRelatedParty WITH (NOLOCK) ON dbo.OrgHeader.OH_PK = dbo.OrgRelatedParty.PR_OH_Parent INNER JOIN
            dbo.OrgHeader AS OrgHeader_1 WITH (NOLOCK) ON dbo.OrgRelatedParty.PR_OH_RelatedParty = OrgHeader_1.OH_PK
            where OrgHeader_1.OH_PK = @CLIENTPK_NEW
        ) 
        END 
    )
}
AND (@CGNEEPK IS NULL OR CGNEE.OH_PK = @CGNEEPK) AND    
part.OP_RH_NKCommodityCode = @type

谢谢，

阿米特

Answer 1

示例（来自here）：

USE AdventureWorks2008R2;
GO
SELECT JobTitle, MAX(ph1.Rate)AS MaximumRate
FROM HumanResources.Employee AS e
JOIN HumanResources.EmployeePayHistory AS ph1 
    ON e.BusinessEntityID = ph1.BusinessEntityID
GROUP BY JobTitle
HAVING (MAX(CASE WHEN Gender = 'M' 
        THEN ph1.Rate 
        ELSE NULL END) > 40.00
     OR MAX(CASE WHEN Gender  = 'F' 
        THEN ph1.Rate  
        ELSE NULL END) > 42.00)
ORDER BY MaximumRate DESC;

Answer 2

是的，这是有效的语法。但是，the text, image, and ntext data types cannot be used in a HAVING clause。

更新：您更新的示例没有意义。 CLIENT.OH_PK=@CLIENTPK_NEW或者OR都没有，除非你使用{{1}}，否则声明的其余部分是无关紧要的。也许你可以解释一下这种逻辑吗？

Answer 3

来自https://docs.djangoproject.com/en/1.9/ref/models/fields/#django.db.models.CharField

的另一个例子

SELECT EmployeeName ,Country,CompanyPlant,Gender, Total=MAX(PayScale)
FROM Employee
GROUP BY EmployeeName ,Country,CompanyPlant,Gender
HAVING (MAX(CASE WHEN Gender = 'Male'
 THEN PayScale
 ELSE NULL END) > 150.00
 OR MAX(CASE WHEN Gender = 'Female'
 THEN PayScale
 ELSE NULL END) > 180.00)

在sql中的having子句中的case语句

3 个答案: