Question

我有以下查询。并且需要对查询“distinct case”值返回的所有内容进行求和，并在另一列“TotalDepartmentsCount”中填充一行

;WITH CTE
     AS 
     (
     Select t.ID As [CTE_ID]
           ,count(distinct case when e.Department='M' then t.ID else null end) as M_Marketing
           ,count(distinct case when e.Department='S' then t.ID else null end) as S_Sales   
           ,count(distinct case when e.Department='U' then t.ID else null end) as U_Utilization    
           ,count(distinct case when e.Department=' ' then t.ID else null end) as No_NoDepartment
        From dbo.Table t (nolock) 
            Left Join dbo.ClearedEmployee ce (nolock) ON t.ID = ce.building_fk
                 Join dbo.Employee e (nolock) ON ce.employee_fk = e.employee_pk
        Group By t.ID
    )

    Select *,  t.ID 
    From CTE c (nolock)
    FULL JOIN dbo.Table t (nolock) ON t.ID=c.[CTE_ID]
    Order By t.ID ASC;

为此，我在选择列表中添加了此代码：

    sum(cast(e.Department as int)) As TotalDepartmentsCount

但这并没有正确总结（见下面的截图）。请指教。

这就是我想要输出的方式（参见TotalDepartmentsCount表）

Answer 1

您的CTE目前通过基于部门的过滤来计算4个计数。你想要的是包括所有行的第五个计数（例如，没有过滤）。因此，您应该能够将该列添加到CTE中，如下所示：

;WITH CTE
 AS 
 (
 Select t.ID As [CTE_ID]
       ,count(distinct case when e.Department='M' then t.ID else null end) as M_Marketing
       ,count(distinct case when e.Department='S' then t.ID else null end) as S_Sales   
       ,count(distinct case when e.Department='U' then t.ID else null end) as U_Utilization    
       ,count(distinct case when e.Department=' ' then t.ID else null end) as No_NoDepartment
       ,count(distinct t.ID) as TotalDepartmentsCount
    From dbo.Table t (nolock) 
        Left Join dbo.ClearedEmployee ce (nolock) ON t.ID = ce.building_fk
             Join dbo.Employee e (nolock) ON ce.employee_fk = e.employee_pk
    Group By t.ID
)

只要Department列仅包含在不同情况下使用的四个特定值（＆＃39; M＆＃39;，＆＃39; S＆＃39;，＆＃39;你＆＃39;和＆＃39;）。如果您有其他需要忽略的Department值，则可以更改CTE中的TotalDepartmentsCount列，如下所示：

,count(distinct case when e.Department in ('M', 'S', 'U', ' ') then t.ID else null end) as TotalDepartmentsCount

或者您可以简单地计算最终查询中四列的总和，如下所示：

Select c.*
    , (M_Marketing + S_Sales + U_Utilization + No_NoDepartment) as TotalDepartmentsCount
    , t.ID 
From CTE c (nolock)

Answer 2

为什么不在计算完毕后将这些列添加到一起？ e.g：

;WITH CTE
     AS 
     (
     Select t.ID As [CTE_ID]
           ,count(distinct case when e.Department='M' then t.ID else null end) as M_Marketing
           ,count(distinct case when e.Department='S' then t.ID else null end) as S_Sales   
           ,count(distinct case when e.Department='U' then t.ID else null end) as U_Utilization    
           ,count(distinct case when e.Department=' ' then t.ID else null end) as No_NoDepartment
        From dbo.Table t (nolock) 
            Left Join dbo.ClearedEmployee ce (nolock) ON t.ID = ce.building_fk
                 Join dbo.Employee e (nolock) ON ce.employee_fk = e.employee_pk
        Group By t.ID
    )

    Select *
        ,  t.ID
        , isnull(M_Marketing, 0) + isnull(S_Sales, 0) + isnull(U_Utilization, 0) + isnull(No_NoDepartment, 0) as TotalDepartments
    From CTE c (nolock)
    FULL JOIN dbo.Table t (nolock) ON t.ID=c.[CTE_ID]
    Order By t.ID ASC;

SUM从CASE子句语句

2 个答案: