Sql server 内部联接并将多个表分组到一行中
我使用的是MSSQL服务器,我希望Sql server 内部联接并将多个表分组到一行中,sql-server,database,group-by,inner-join,string-aggregation,Sql Server,Database,Group By,Inner Join,String Aggregation,我使用的是MSSQL服务器,我希望内部连接和分组来自多个表的数据。但我有一个错误: 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: 表格库存 StockID StockName ------------
内部连接
和分组
来自多个表的数据。但我有一个错误:
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:
表格库存
StockID StockName
---------------------------
1 StockOne
2 StockTwo
表格用户
EmployeeID EmployeeName
---------------------------
A001 ABC
A002 ABCD
表格申请
RequisitionID RequestDetailsID RequestNumber EmployeeID
---------------------------------------------------------------
1 1 RN001 A001
2 2 RN001 A001
3 3 RN002 A002
4 4 RN003 A001
表格请购单详细信息
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
预期产出
RequestNumber RequestDetailsID EmployeeID EmployeeName StockID
------------------------------------------------------------------------------
RN001 1, 2 A001 ABC 1, 2
RN002 3 A002 ABCD 1
RN003 4 A001 ABC 2
出于几个原因,这是一个棘手的问题。首先,SQLServer有一种相当痛苦的方式来进行聚合字符串连接。然后,您会遇到在不同的表中连接请求编号和员工的问题 据我所知,您只需要两个表,
requisition
和requisition\u details
。以下查询应接近您所需的内容:
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,
好吧,如果我也需要雇员姓名和股票ID呢?作为requestDetailId,xml路径(“”)),1,2,,)的函数是什么,2@AthirahHazira . . . (1) 您将加入外部查询中的
user
表;(2) 此查询具有股票ID。无论如何,我尝试过您的查询,但出现了一个错误,显示在将varchar值“”转换为数据类型int时,转换失败。
除了我的上一条注释之外,当我去掉逗号时,查询返回的值如下所示126127
我不明白。我的意思是,我到处搜索,每个人都用逗号或分号来分隔值,效果很好。我也尝试过其他示例,但错误仍在字符串上conversion@AthirahHazira . . . 只有当StockId
或RequestDetailsId
where numeric时才会发生这种情况。但根据问题中相同的数据,它们显然不是。当然,您可以将它们包装在cast()中作为varchar(255))
。