sql-server-2008 - 针对不同的条件将两个更新语句合二为一

Question

我需要一种快速编写更新查询的方法

UPDATE Content
SET Status = 1
WHERE Id in (SELECT userId from [User] where Location = 'US')

在此查询本身中，我想 SET Status = 0 WHERE Id NOT IN(SELECT userId from [User])。

基本上，我想将两个更新合二为一。

UPDATE Content
SET Status = 1
WHERE Id in (SELECT userId from [User] where Location = 'US')

AND

UPDATE Content
SET Status = 0
WHERE Id NOT in(SELECT userId from [User] where Location = 'US')

，谢谢

Answer 1

像这样的东西应该工作：

update c
set Status = case when u.userId is not null then 1 else 0 end
from Content c
  left join [User] u on c.id = u.userId and u.Location = 'US'

对于每一Content行，我们检查是否有相应的美国用户并进行相应的设置Status。