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

What about

SELECT * FROM users, tags WHERE tags.user_id = users.user_id AND tags.name = 'tag1'
INTERSECT
SELECT * FROM users, tags WHERE tags.user_id = users.user_id AND tags.name = 'tag2'