SQL动态ORDER BY使用别名

行使SQL Server,我可以行使别名来呼吁正常的SELECT查询：

SELECT   
   u.FirstName + ' ' + u.LastName as PhysicianName,COUNT(r.Id) as ReferralsCount
FROM     
   Referrals r 
INNER JOIN
   Users u ON r.PhysicianId = u.Id
GROUP BY 
   r.PhysicianId,u.FirstName,u.LastName
ORDER BY 
   PhysicianName

可是,实行行使动态ORDER BY执行沟通的操纵：

SELECT   
   u.FirstName + ' ' + u.LastName as PhysicianName,COUNT(r.Id) as ReferralsCount
FROM     
   Referrals r 
INNER JOIN
   Users u ON r.PhysicianId = u.Id
GROUP 
   BY r.PhysicianId,u.LastName
ORDER BY 
    CASE WHEN @orderby = 'PhysicianName' THEN PhysicianName END,CASE WHEN @orderby = 'ReferralsCount' THEN ReferralsCount END

发生以下错误：

Msg 207,Level 16,State 1,Line 10
Invalid column name ‘PhysicianName’.
Msg 207,Line 11
Invalid column name ‘ReferralsCount’.

办理要领

您可以按如下方法调解原始实行.

;WITH T
     AS (SELECT u.FirstName + ' ' + u.LastName AS PhysicianName,COUNT(r.Id)                    AS ReferralsCount
         FROM   Referrals r
                INNER JOIN Users u
                  ON r.PhysicianId = u.Id
         GROUP  BY r.PhysicianId,u.LastName)
SELECT *
FROM   T
ORDER  BY CASE
            WHEN @orderby = 'PhysicianName' THEN PhysicianName
          END,CASE
            WHEN @orderby = 'ReferralsCount' THEN ReferralsCount
          END

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