在mssql中同时删除和更新

Question

我在 mssql 服务器上有一份 deleting.But 的工作，我希望在删除之前更新另一个 table。我有两个 table，由 "user_id" 列连接，我的 table 的名字是 "UserInfo" 和 "AdvertInfo"，它们与 user_id 列连接.我将在 7 天后删除 giving_advert_day。但是当它被删除时，我想增加 (+1) user_advert_number 列。如果在 user_id 中删除，从 table 中删除 3 或 4 等数据，那么来自它们的连接数据将增加 +3、+4 或蚀刻。有办法吗？这是我的删除命令

Delete from AdvertInfo where advert_id In (
select advert_id from AdvertInfo
 where advert_begin_date <  DATEADD(day, -7, GETDATE()))

Answer 1

您可以 UPDATE 与 JOIN:

UPDATE u
SET u.user_advert_number = u.user_advert_number + 1
FROM UserInfo as u
INNER JOIN AdvertInfo AS a ON u.user_id = a.user_id
WHERE a.advert_begin_date <  DATEADD(day, -7, GETDATE()))

顺便说一句，你的 delete 子句可以这样写：

Delete 
from AdvertInfo 
where advert_begin_date <  DATEADD(day, -7, GETDATE()))

不需要 IN 谓词。

您还可以创建一个 create a trigger，以执行 after delete，例如以您想要的方式更新列。

Answer 2

使用下面的查询来实现你想要的：

DECLARE @Temp TABLE (
    [user_id] INT
)

DELETE i
OUTPUT deleted.[user_id] INTO @Temp
FROM AdvertInfo i
WHERE advert_begin_date <  DATEADD(day, -7, GETDATE())

UPDATE u
SET u.user_advert_number = u.user_advert_number + d.cnt
FROM UserInfo as u
    INNER JOIN (
        SELECT [user_id], COUNT([user_id]) AS cnt
        FROM @Temp
        GROUP BY [user_id]
    ) d ON d.[user_id] = u.[user_id]

Answer 3

Merhaba Kaya，也许你可以使用 SQL OUTPUT clause 如下您可能已经知道，在执行 DELETE 命令时，您可以使用 OUTPUT 子句将受影响的数据放入变量 table 并且正如您在以下示例中看到的那样，您可以稍后使用它

DECLARE @Deleted table (  
    user_id int
);  

DELETE FROM AdvertInfo
OUTPUT DELETED.user_id
INTO @Deleted 
WHERE advert_begin_date <  DATEADD(day, -7, GETDATE())

update u
set user_advert_number = isnull(user_advert_number,0) + 1
from UserInfo as u
inner join @Deleted d on d.user_id = u.user_id

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