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[英]How to find duplicates in a SQL Server table which has trailing spaces values in a column
[英]SQL Server : find duplicates in a table based on values in a single column
我有一個SQL Server表,其中包含以下字段和示例數據:
ID employeename
1 Jane
2 Peter
3 David
4 Jane
5 Peter
6 Jane
ID
列具有每行的唯一值。
employeename
專欄有重復。
我希望能夠根據employeename
列找到重復項,並列出以逗號分隔的副本旁邊的ID
。
上述樣本數據的預期輸出:
employeename IDs
Jane 1,4,6
Peter 2,5
表中還有其他列,我不想為此查詢考慮。
感謝你的幫助!
select
employeename,
IDs = STUFF((SELECT ','+ CAST(e2.[ID] AS VARCHAR(10))
FROM emp e2
WHERE e2.employeename = e1.employeename
For XML PATH('')
),1,1,'')
FROM emp e1
GROUP BY employeename having COUNT(*) > 1
這是Northwind示例:
Use Northwind
GO
SELECT
ord1.CustomerID,
OrderIdList = substring((SELECT ( ', ' + convert(varchar(16) , OrderID) )
FROM [dbo].[Orders] ord2
WHERE ord1.CustomerID = ord2.CustomerID
ORDER BY
CustomerID,
OrderID
FOR XML PATH( '' )
), 3, 1000 )FROM [dbo].[Orders] ord1
GROUP BY CustomerID
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