I think I found the answer to my question, I\'m just unsure of the syntax, I keep getting SQL errors.
Basically, I want to do the opposite of IN. Take this example:<
You'll want to join the tags table again.
SELECT * FROM users INNER JOIN tags as t1 on t1.user_id = users.id and t1.name='tag1' INNER JOIN tags as t2 on t2.user_id = users.id and t2.name='tag2'