Sql 将选择查询更改为更新

我无法将下面的选择查询更改为更新查询。有人能帮忙吗

SELECT 
CONVERT(varchar(10), (ROW_NUMBER() over (order by (select null)))) + 'Test@' +(SELECT SUBSTRING(Email, CHARINDEX('@', Email) + 1, LEN(Email) - CHARINDEX('@', Email))) as Email
,CONVERT(varchar(10), (ROW_NUMBER() over (order by (select null)))) + 'Media' as [Last Name]
from dbo.MPP_Inserts as MT

我尝试了以下操作，但收到一条错误消息：

窗口函数可以显示在select或order by子句中）

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看起来您正在使用SQL Server。如果是，则您有可更新的CTE：

with toupdate as (
    SELECT mt.*,
           CONVERT(varchar(10), (ROW_NUMBER() over (order by (select null)))) + 'Test@' +(SELECT SUBSTRING(Email, CHARINDEX('@', Email) + 1, LEN(Email) - CHARINDEX('@', Email))) as new_Email,
           CONVERT(varchar(10), (ROW_NUMBER() over (order by (select null)))) + 'Media' as new_lastname
    from dbo.MPP_Inserts MT
   )
update toupdate
    Set Email = new_email,
       [Last Name] = new_lastname;

子字符串中嵌套的

select

是完全不必要的，但是我将保持表达式不变，以便它们与查询中的表达式相同。但是，

new_email

可以表示为：

CONVERT(varchar(10), (ROW_NUMBER() over (order by (select null)))) + 'Test@' +SUBSTRING(Email, CHARINDEX('@', Email) + 1, LEN(Email) - CHARINDEX('@', Email)) as new_Email,

---

第一件事是将dbo.MPP\u插入中的

作为MT

字符串在末尾删除。。。

CONVERT(varchar(10), (ROW_NUMBER() over (order by (select null)))) + 'Test@' +SUBSTRING(Email, CHARINDEX('@', Email) + 1, LEN(Email) - CHARINDEX('@', Email)) as new_Email,