Question

Consider a simplified table schema of a StackOverflow-like system:

Tables:
User ( id, name )
Question ( id, user_id, question )
Vote ( id, question_id )

How would I write a SQL query that would

• List each user along with the total votes for all his questions, ordered by most votes?
• Given a user_id, return a single user record, along with his total votes?

User Name | Total Votes (desc)

Answer 1

select User.id,
User.name,
count(vote.id) as Votes
from User 
left join Question
on User.id = Question.user_id
left join Vote
on Vote.question_id = Question.id
group by user.id, User.name
order by 3 desc