Number of upvotes per contributor and product

gistfile1.sql

SELECT `auth_user`.`username`, count(*) as votes
FROM `questions_answer`
JOIN `questions_answervote` ON `questions_answervote`.`answer_id` = `questions_answer`.`id`
JOIN `questions_question` ON `questions_question`.`id` = `questions_answer`.`question_id`
JOIN `auth_user` ON `auth_user`.`id` = `questions_answer`.`creator_id`
WHERE `questions_answervote`.`created` >= '2014-01-01' AND`questions_answervote`.`created` <= '2014-12-01'
AND `questions_question`.`product_id`=2
AND `questions_answervote`.`helpful`=1
GROUP by `questions_answer`.`creator_id` ORDER BY votes DESC limit 100