MySQL select specific entry from a table which is not in another table

Question

I have a problem in MySQL when trying to select specific entry from table which is not in another table. I know this sentence sounds nuts but here is an example what I am trying

Answer 1

SELECT user_id FROM users u
LEFT JOIN views v ON v.user_id=u.user_id AND v.article_id = 10
WHERE v.user_id IS NULL