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我正在使用 MSSQL Server，我想INNER JOIN和GROUP来自多个表的数据。但我得到了这个错误：

Column 'MyDB.dbo.USER.EmployeeID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

假设我有如下表格：

表股票

    StockID        StockName
    ---------------------------
    1              StockOne
    2              StockTwo

表用户

    EmployeeID    EmployeeName
    ---------------------------
    A001          ABC
    A002          ABCD

表申请

    RequisitionID    RequestDetailsID    RequestNumber   EmployeeID
    ---------------------------------------------------------------
    1                1                   RN001           A001
    2                2                   RN001           A001
    3                3                   RN002           A002
    4                4                   RN003           A001

表 REQUISITION_DETAILS

    RequestDetailsID   EmployeeID    StockID
    ------------------------------------------
    1                 A001          1
    2                 A001          2
    3                 A002          1
    4                 A001          2

这是我的SQL 语法：

SELECT *

    FROM [MyDB].[dbo].[USER] A

    INNER JOIN
    [MyDB].[dbo].[REQUISITION] B
    ON
    B.EmployeeID = A.EmployeeID

    INNER JOIN  
    [MyDB].[dbo].[REQUISITION_DETAILS] C
    ON
    C.RequestDetailsID = B.RequestDetailsID

    INNER JOIN [MyDB].[dbo].[STOCK] D
    ON
    D.StockID = C.StockID

    WHERE EmployeeID = '$EpID'
    GROUP BY B.RequestNumber

预期输出

    RequestNumber   RequestDetailsID   EmployeeID    EmployeeName     StockID
    ------------------------------------------------------------------------------
    RN001           1, 2               A001          ABC              1, 2
    RN002           3                  A002          ABCD             1
    RN003           4                  A001          ABC              2
4

1 回答 1

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由于几个原因，这是一个棘手的查询。首先，SQL Server 有一种相当痛苦的方式来进行聚合字符串连接。然后，您会遇到连接不同表中的请求编号和员工的问题。

据我所知，您只需要两个表，requisition并且requisition_details. 以下查询应该接近您的需要：

select distinct r.RequestNumber, r.EmployeeId,
       stuff((select ', ' + cast(rd.RequestDetailsId as varchar(255))
              from requisition r2 join
                   requisition_details rd
                   on r2.RequestDetailsID = rd.RequestDetailsID
              where r2.RequestNumber = r.RequestNumber and r2.EmployeeId = r.EmployeeId
              for xml path ('')
             ), 1, 2, '') as RequestDetailIds,
       stuff((select ', ' + cast(rd.StockId as varchar(255))
              from requisition r2 join
                   requisition_details rd
                   on r2.RequestDetailsID = rd.RequestDetailsID
              where r2.RequestNumber = r.RequestNumber and r2.EmployeeId = r.EmployeeId
              for xml path ('')
             ), 1, 2, '') as StockIds
from requisition r

编辑：

要插入换行符，我只需使用：

       stuff((select '
' + cast(rd.RequestDetailsId as varchar(255))
              from requisition r2 join
                   requisition_details rd
                   on r2.RequestDetailsID = rd.RequestDetailsID
              where r2.RequestNumber = r.RequestNumber and r2.EmployeeId = r.EmployeeId
              for xml path ('')
             ), 1, 2, '') as RequestDetailIds,
于 2014-12-02T04:10:20.907 回答