Question

我有这样的查询，

select * from (      
select  a.CreatedMonth,Total_Days,case when a.Type = 'Invalid_Question' then 'Invalid'       
                  when a.Type = 'Valid_Question' then 'Valid' 
                  end as Type      
from      
(      
  select  CreatedMonth,Type,sum(Questions_Count*LastDays) /sum(Questions_Count) as Total_Days      
 from   #t       
 group by  CreatedMonth,Type      
) a      
)as d pivot(sum(Total_Days) for Type in (Invalid, Valid)) as p

但是在输出中，Valid为null。我必须将它的值从null设置为0.另外，我在哪里修改代码，在case语句或pivot中？

这是我目前的结果，

CreatedMonth    Invalid    Valid
    1              50        32
    2              63        47 
    3              70       NULL

我该怎么做？

Answer 1

select CreatedMonth
      ,ISNULL(Invalid,0) AS Invalid 
      ,ISNULL(Valid  ,0) AS Valid
from (      
select  a.CreatedMonth
       ,Total_Days
       ,case 
             when a.[Type] = 'Invalid_Question' then 'Invalid'       
             when a.[Type] = 'Valid_Question'   then 'Valid' 
        end as [Type]      
from      
(      
  select  CreatedMonth
         ,[Type]
         ,sum(Questions_Count*LastDays) /sum(Questions_Count) as Total_Days      
  from   #t       
 group by  CreatedMonth,[Type]      
) a      
)as d pivot(sum(Total_Days) 
            for [Type] 
            in ([Invalid], [Valid])) as p

在sql server的case语句中将isnull替换为0

1 个答案: