Question

我有一个（sql server 2008）查询，如下所示：

 Select *, column1+column2 as alias1
 From complaints
 Order by 
 Case 
   When @param1 = 'filedate' then filedate
   When @param1 = 'calc' then alias1
 End

这不起作用，因为不允许在case语句中对别名进行排序，它不会识别alias1。

还有其他方法可以做到吗？

由于

Answer 1

要么把它放在CTE中，然后按......排序。

; with cteQuery as (Select *, column1+column2 as alias1 from complaints)
SELECT * from cteQuery Order by 
Case 
   When @param1 = 'filedate' then filedate
   When @param1 = 'calc' then alias1
 End

或者只是复制别名实际引用的内容......

Select *, column1+column2 as alias1
 From complaints
 Order by 
 Case 
   When @param1 = 'filedate' then filedate
   When @param1 = 'calc' then column1+column2
 End

Answer 2

最简单的答案：

 Select complaints.*, column1+column2 as alias1
 From complaints
 Order by 
 Case 
   When @param1 = 'filedate' then filedate
   When @param1 = 'calc' then column1+column2
 End

Answer 3

Select *, column1+column2 as alias1  
From complaints  
Order by   Case
     When @param1 = 'filedate' then filedate
    When @param1 = 'calc' then column1+column2
  End

OR

SELECT *
FROM (    Select *, column1+column2 as alias1  
    From complaints ) c 
    Order by   Case
         When @param1 = 'filedate' then filedate
        When @param1 = 'calc' then alias1
      End

SQL：在case case语句中使用别名

3 个答案: