Question

The following is what I got right now, which does not work properly because it checks one row for two different values.

SELECT users.* 
FROM users INNER JOIN roles_users ru ON users.id = ru.user_id
WHERE ru.role_id = 1 AND ru.role_id = 2 

I would like to select all users that have two rows in roles_users. The one rows role_id should have one and the second should have role_id two.

So select all users that have two rows in the roles_users where one of them has role_id = 1 and the other has role_id = 2.

The above query selects all users that have one row in roles_users that has first one and then two, that’s why I get no results and it does not work. So how can I do this right?

Answer 1

SELECT users.id
FROM users INNER JOIN roles_users ON users.id = roles_users.user_id 
WHERE roles_users.role_id IN (1, 2)
GROUP BY users.id
HAVING COUNT(*) = 2