Question

I am having problem sorting joined mysql results, having two related tables:

Table users:

id, name
--------
1,  Alex
2,  John

Table votes:

user_id, vote
-------------
1,         1
1,         1
1,         1
1,        -1
1,        -1
2,         1
2,         1
2,         1

Alex have 1 vote score in summary
John have 3.
Therefore John will be first, Alex second.

How can i get users list ordered by sum of “vote” field on votes table ?
“vote” field are integer (can be 1,-1,0 or any other integer).

Answer 1

You could use this MySql query that uses GROUP BY, and aggregated function SUM:

SELECT name
FROM users inner join votes
     ON users.id = votes.user_id
GROUP BY users.id
ORDER BY SUM(vote) DESC

see it here.