Question

Hi all is it possible to rewrite query:

select userid from User where userid not in(select userid from UserRole where roleid in(8));

as Join?

the problem is that one user may have several roles
thank you in advance.

 mysql> desc User;   +--------------------+-------------------+------+-----+---------+----------------+   | Field              | Type              | Null | Key | Default | Extra          |   +--------------------+-------------------+------+-----+---------+----------------+   | userId             | int(11)           | NO   | PRI | NULL    | auto_increment |   | userName           | varchar(50)       | YES  |     | NULL    |                |   

…and other user related columns

 mysql> desc UserRole;   +--------+---------+------+-----+---------+-------+   | Field  | Type    | Null | Key | Default | Extra |   +--------+---------+------+-----+---------+-------+   | userId | int(11) | NO   | PRI | 0       |       |   | roleId | int(11) | NO   | PRI | 0       |       |   +--------+---------+------+-----+---------+-------+   

Answer 1

Maybe this will work?

select userid from User  left outer join (select userid, roleid from UserRole where roleid in(8)) v on User.userid = v.userid where roleid is null;