Question

我正在使用一组数据，其中有一个ID字段和一个USERS字段。某些用户具有相同的名称但具有不同的ID。我需要帮助整合数据集，以便每个用户都有一个唯一的ID。在下面的示例中，您将看到我如何在单个ID（1）下合并两个Bob用户。任何帮助将非常感激。谢谢！

**ID         User**
1          Bob 
2          Tom
3          Jim
4          Dan
5          Bob

**ID         User**
1          Bob 
2          Tom
3          Jim
4          Dan

Answer 1

您可以使用窗口ROW_NUMBER函数来识别第一条记录，并删除其他所有内容：

;With ToDelete As
(
    Select  *,
            Row_Number() Over (Partition By [User] Order By Id Asc) As RN
    From    Users
)
Delete  ToDelete
Where   RN <> 1

Answer 2

创建一个CTE，然后从CTE中删除。应该很快。

/* SETUP */
CREATE TABLE #test (id int identity, user varchar(10))
INSERT INTO #test (user)
VALUES ('bob') , ('Tom') , ('Jim') , ('Dan') , ('Bob')
; 

/* BEFORE */
SELECT * FROM #test ;

/* DELETE QUERY */
WITH fullList AS (
    SELECT id, user
        , ROW_NUMBER() OVER ( PARTITION BY user ORDER BY id ) AS rn
    FROM #test
)
DELETE FROM fullList WHERE rn > 1
;

/* AFTER */    
SELECT * FROM #test ;

Answer 3

第一步，查找重复记录（相同的ID和用户）

WITH CTE
AS (SELECT *,
        ROW_NUMBER() OVER (PARTITION BY id,User ORDER BY ID) AS RowNumber
    FROM #Employees
   )
SELECT * FROM CTE

--DELETE FROM CTE WHERE RowNumber > 1;

然后更改Query以查找相同的用户：

WITH CTE
AS (SELECT *,
        ROW_NUMBER() OVER (PARTITION BY User ORDER BY ID) AS RowNumber
    FROM #Employees
   )
SELECT * FROM CTE
--DELETE FROM CTE WHERE RowNumber > 1;

如何在一个ID下合并具有相同名称的用户

3 个答案: