Question

我正在尝试从MS Access在一个具有配置文件和许多用户的表中创建SQL查询，并能够识别哪些配置文件没有特定用户。

示例我想返回不不包含用户 UserA

的个人资料

个人资料表

Profile     User
A           UserA
A           UserB
A           UserC
A           UserD
B           UserB
B           UserC
C           UserA
D           UserV

输出

Profile
B
D

Answer 1

一种方法是group by和having：

select p.profile
from profile as p
group by p.profile
having sum(iif(p.user = "UserA", 1, 0)) = 0;

Answer 2

您可以使用NOT EXISTS：

select distinct profile from tablename as t
where not exists (
  select 1 from tablename as tt
  where tt.profile = t.profile and user = 'UserA'  
)

Answer 3

对于它的价值，您还可以使用联接：

select distinct t1.profile
from YourTable t1 left join 
(select t2.profile as p from YourTable t2 where t2.user = "UserA") t3 on t1.profile = t3.p
where t3.p is null

或not in：

select distinct t1.profile
from YourTable t1
where t1.profile not in (select t2.profile from YourTable t2 where t2.user = "UserA")

将YourTable更改为表格名称。

SQL：从表内的组返回

3 个答案: