ms访问sql语句选择具有角色a和b的用户

Question

我想选择具有角色A和/或B但不包含角色c的用户。我试过这个查询，但它不起作用。

SELECT User from table1 where (role ="A" or role = "B") and (Role <> "C"). 

用户可以有多个角色。然后可以有ABC，AC，AB ...

Answer 1

我想如果你只是省略role <> "C"它会只有得到role=A and role=B的行。另外，看文档，看起来你的括号在你的(role ="A" or role = "B")是不必要的。

Answer 2

谢谢你们我想通了

SELECT DISTINCT a.User, a.ROLE 
FROM table1 AS a 
WHERE (((a.User) Not In (select user from table1 where 
ROLE = "ROLEC" and user = a.user)) AND ((a.ROLE)="ROLEA" Or (a.ROLE)="ROLEB") 
ORDER BY a.User;