UPDATE Table 与 CTE 更新始终具有相同的值

Question

我正在尝试通过数据混洗对数据库中的单个列进行匿名处理。

我创建了这个查询，但是当我运行它更新列 FirstName 时总是使用相同的名称：

BEGIN TRAN;

;WITH TCE_Shuffled
AS (
    SELECT ROW_NUMBER() OVER (
            ORDER BY [BusinessEntityID]
            ) AS ORIG_ROWNUM
        ,ROW_NUMBER() OVER (
            ORDER BY NEWID()
            ) AS NEW_ROWNUM
        ,*
    FROM [AdventureWorks2014].[Person].[Person]
    )
UPDATE [AdventureWorks2014].[Person].[Person]
SET FirstName = t2.FirstName
FROM TCE_Shuffled t1
JOIN TCE_Shuffled t2 ON t1.ORIG_ROWNUM = t2.NEW_ROWNUM

SELECT *
FROM [AdventureWorks2014].[Person].[Person]

ROLLBACK TRAN

SELECT *
FROM [AdventureWorks2014].[Person].[Person]

在这里您可以看到 FirstName 列具有相同的值：

BusinessEntityID	PersonType	Title	FirstName	MiddleName	LastName
13353	IN	NULL	Erik	M	Griffin
13354	IN	NULL	Erik	NULL	Diaz
13355	IN	NULL	Erik	J	Xu
13356	IN	NULL	Erik	NULL	Sun
13357	IN	NULL	Erik	NULL	Zhu
13358	IN	NULL	Erik	R	Gao
13359	IN	NULL	Erik	NULL	Hayes
13360	IN	NULL	Erik	NULL	Ma
13361	IN	NULL	Erik	G	Price
13362	IN	NULL	Erik	M	Liang

我做错了什么？

Answer 1

这是 UPDATE 语句的正确语法：

UPDATE t1
SET t1.FirstName = t2.FirstName
FROM TCE_Shuffled t1 JOIN TCE_Shuffled t2 
ON t1.ORIG_ROWNUM = t2.NEW_ROWNUM;

UPDATE Table 与 CTE 更新始终具有相同的值

UPDATE Table with CTE update always with the same value

tsql

sql-server

join

common-table-expression

sql-update