Question

I have two tables, one for admins, and one for users. I want a single html select box of both admins and users. I only want active users/admins, where that user/admin also has an entry in the foo table.
Here is my MySQL query so far:

SELECT * FROM users u, admins a, foo f WHERE u.active ='1' AND (a.admin_id = f.admin_id OR u.user_id = f.user_id)

Unfortunately, this puts out a nonsense result.
Thanks in advance!

Answer 1

I’m going to guess your tables are set up like this.

foo (user_id, admin_id, ...)
users (user_id, active, ...)
admin (admin_id, active, ...)

If that is the case then apart from rethinking your database design (one table for all users with each user being assigned a user_level) you could try a UNION

SELECT users.user_id AS id
FROM foo INNER JOIN users ON foo.user_id = users.user_id
WHERE users.active = '1'
UNION
SELECT admins.admin_id
FROM foo INNER JOIN admins ON foo.user_id = admins.admin_id
WHERE admins.active = '1'