SQL for applying conditions to multiple rows in a join

Question

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:<

Answer 1

select * from users u
where 2 = (select count(*) from tags t where t.user_id = u.id and name in ('tag1','tag2'))

Assuming that any given tag can only be present once per user.