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

doing NOT IN queries are not typically great for performance... instead, using LEFT JOIN and looking for NULL would be better.

select 
      u.User_ID
   from 
      Users U
         LEFT JOIN Views V
            on U.User_ID = V.User_ID 
           AND v.Article_ID = 10
   where
      V.User_ID IS NULL