SQL query at least one of something

Question

I have a bunch of Users, each of whom has many Posts. Schema:

Users: id
Posts: user_id, rating

How do I find all Users who have at least one po

Answer 1

SELECT max(p.rating), u.id 
  from users u 
INNER JOIN posts p on users.id = p.user_id 
where p.rating > 10 
group by u.id;

Additionally, this will tell you what their highest rating is.