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 to do.

Table users:

    user_id,username,password (plus other columns not important to this)

Table articles:

    article_is,user_id,content (plus others)

Table views (used to store data if user viewed specific article):

   view_id,article_id,user_id,date

Now, I am trying to select those users who has NOT read a specific article, for example article with id 10. So they have no entry in the views table.

I hope it makes more sense now.
Thanks for your answers. V.

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