如何修复此错误“为“piv”指定了多次“区域 ID”列

Question

我想显示检查员姓名、检查员职位、地区和项目，检查员根据我正在使用枢轴但我得到的月份进行检查 “为‘piv’多次指定了‘DistrictID’列。”这个错误...

请帮助我克服这个错误

Declare @SQLQuery nvarchar(MAX)
If(OBJECT_ID('tempdb..#TBL1') Is Not Null)
Begin
    Drop Table #TBL1
End

CREATE TABLE #TBL1
(

 ID int,
InspPost nvarchar (MAX),
InspPostHin nvarchar(MAX)

)
SET @SQLQuery ='INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (1, N''Child Development Project Officer'', N''??? ????? ???????? ?????????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (2, N''Lady Superviser'', N''????? ????????????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (3, N''Other'', N''???? ?????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (4, N''District Program Officer'', N''???? ????????? ?????????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (5, N''J.P.C/State Level Officer'',N''??.??.??../???? ???????? ????? ?????? ???????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (6, N''S.P.M.U/Technical Consultant'', N''??.??..??.??. - ?????? ???????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (7, N''District Coordinator'', N''???? ???????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (8, N''Project Coordinator'', N''?????? ???????'')
INSERT into #TBL1 ([ID], [InspPost], [InspPostHin]) VALUES (9, N''Swasth Bharat Prerak'', N''?????? ???? ??????'')'

exec (@SQLQuery)
select * from 
(
    select Districtmaster.DistrictID,ProjectMaster.ProjectID,Districtmaster.DistrictNameHn,ProjectMaster.ProjectNameHn from Districtmaster Districtmaster 
    inner join ProjectMaster ProjectMaster on Districtmaster.DistrictID=ProjectMaster.DistID

) a1
inner join
(
  select Supervision_Checklist.ID,Supervision_Checklist.Inspector_Name,
  Supervision_Checklist.DistrictID,Supervision_Checklist.ProjectID,
  Supervision_Checklist.Inspector_Type,(#TBL1.InspPost) as inptype ,Supervision_Checklist.Month
  from Supervision_Checklist Supervision_Checklist 
  inner join #TBL1 #TBL1 
  on Supervision_Checklist.Inspector_Type=#TBL1.ID
) src on a1.DistrictID=src.DistrictID and a1.ProjectID=src.ProjectID 
pivot (count(id) for Month in ([1],[2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12])) piv

我想要的结果如下...

enter image description here

Answer 1

PIVOT 有效地对 当前在结果集中且 未在数据透视表中提及的所有列执行 GROUP BY。

如果您已经加入了一些操作，那么您很可能（如这里）最终会得到多个同名的列 (DistrictID)。即使我们知道DistrictID 的值在每一行上都是相等的，但优化器却不会，并会生成此错误。

我们需要做的是投影掉我们不希望包含在此分组操作中的列。但是没有方便的方式来表达这种“内联”。我们需要有一个SELECT 子句，并且我们需要PIVOT 位于该SELECT 子句的“另一边”。

通常，我们会使用子查询或 CTE：

;With AllResults as (
    select
      id,
      month,
      /* We cannot use * here. We need only those columns needed by the pivot
         or which should appear in the final result */
    from 
    (
        select Districtmaster.DistrictID,ProjectMaster.ProjectID,Districtmaster.DistrictNameHn,ProjectMaster.ProjectNameHn from Districtmaster Districtmaster 
        inner join ProjectMaster ProjectMaster on Districtmaster.DistrictID=ProjectMaster.DistID

    ) a1
    inner join
    (
      select Supervision_Checklist.ID,Supervision_Checklist.Inspector_Name,
      Supervision_Checklist.DistrictID,Supervision_Checklist.ProjectID,
      Supervision_Checklist.Inspector_Type,(#TBL1.InspPost) as inptype ,Supervision_Checklist.Month
      from Supervision_Checklist Supervision_Checklist 
      inner join #TBL1 #TBL1 
      on Supervision_Checklist.Inspector_Type=#TBL1.ID
    ) src on a1.DistrictID=src.DistrictID and a1.ProjectID=src.ProjectID 
)
select *
from AllResults
pivot (count(id) for Month in ([1],[2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12])) piv