要知道最后更新的是哪一行，需要新建一个DATETIME/DATETIME2类型的列> 并使用触发器对其进行更新.没有一种数据类型会在每次更新行时自动使用日期/时间信息进行自我更新.

To know which row was last updated, you need to create a new column of type DATETIME/DATETIME2 and update it with a trigger. There is no data type that automatically updates itself with date/time information every time the row is updated.

为避免递归，您可以在触发器中使用 UPDATE() 子句，例如

To avoid recursion you can use the UPDATE() clause inside the trigger, e.g.

ALTER TRIGGER dbo.SetLastUpdatedBusiness 
ON dbo.Businesses 
AFTER UPDATE -- not insert!
AS
BEGIN
    IF NOT UPDATE(LastUpdated)
    BEGIN
        UPDATE t
            SET t.LastUpdated = CURRENT_TIMESTAMP -- not dbo.LastUpdated!
            FROM dbo.Businesses AS t -- not b!
            INNER JOIN inserted AS i 
            ON t.ID = i.ID;
    END
END
GO

在现代版本中，您可以使用临时表欺骗 SQL Server:

In modern versions you can trick SQL Server into doing this using temporal tables:

• 在没有触发器的情况下维护 LastModified

但这充满了警告和限制，实际上只是在忽略其他多个类似的帖子:

But this is full of caveats and limitations and was really only making light of multiple other similar posts:

• 系统维护的 LastModifiedDate 列李>
• 随时间跟踪行更改栏目
• 如何添加created"和updated"没有触发器的时间戳
• 需要一个自动更新的日期时间列