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TSQL:如何使用另一个相关表中的 xml 标记值更新 xml 标记的值?

UPDATE v2
 SET
 [xml].modify ('replace value of (//TAG1/text())[1] 
                with "CAST(v1.[xml].query(''//TAG2'') AS NVARCHAR(MAX))"')
FROM 
 table2 v2, 
 table1 v1 
WHERE
 v2.id = v1.id

DECLARE @NewValue NVARCHAR(50)

SELECT @NewValue = [xml].value('(//TAG2)[1]', 'NVARCHAR(50)')
FROM dbo.v1 
WHERE id = 1

UPDATE dbo.v2
SET [xml].modify('replace value of (//TAG1/text())[1] with sql:variable("@NewValue")')
WHERE id = 1

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