Question

基本上我有一个测试用例场景，我需要将计算的百分比分配给文本值。例如。＆LT; 80 =＆＃39; B＆＃39; ＆LT; 70 =＆＃39; C＆＃39;

以下是我的代码的相关部分，它根据提交的分配数量将值拉入百分比。

Select *...
    100 * COUNT(CASE TurnedIn WHEN 1 THEN 1 ELSE NULL END) 
                             / COUNT(TurnedIn) AS Percentage, 
From Table1
When ...

我尝试用

这样的案例包装它

Case when (100 * COUNT(CASE TurnedIn WHEN 1 THEN 1 ELSE NULL END) 
                             / COUNT(TurnedIn)) <= 80  Then 'B' As LetterGrade

但到目前为止没有运气。

Answer 1

你可以试试这个，

With CTE as
(

Select (100 * COUNT(CASE TurnedIn WHEN 1 THEN 1 ELSE NULL END) 
                      / COUNT(TurnedIn))        as Percentage

  from myTable          
)           
select Case When Percentage <70 
            Then 'C' 
            When Percentage <80
            Then 'B' 
            Else 'A'
        End
 from CTE

Answer 2

写为：

    Select *, --name all columns you want
           case when Percentage < 80 then 'B'
                when  Percentage < 70 then 'C'
                else 'Add the grade which should be default when above 2 
                      case conditions are not met'
           end as LetterGrade
    from (      
    Select *,
        100 * COUNT(CASE TurnedIn WHEN 1 THEN 1 ELSE NULL END) 
                                 / COUNT(TurnedIn) AS Percentage 
    From Table1
    When ..) T

如何在SQL视图中将字符串值分配给数值

2 个答案: