MySQL SUM + SUM - mysql

Question

I've got three tables essentially:
hunt_c_users
hunt_c_collected_eggs
hunt_c_achievements
I'm grabbing a leaderboard currently only using hunt_c_users with a LEFT JOIN on hunt_c_collected_eggs but now I need to include hunt_c_achievements points also.'
Currently my query is:
SELECT
hunt_c_users.id AS 'id',
CONCAT(first_name, ' ', LEFT(last_name,1), '. From ', city) AS 'user_byline',
fbid AS 'user_fbid',
SUM(hunt_c_collected_eggs.value) AS user_points
FROM hunt_c_users
LEFT JOIN hunt_c_collected_eggs ON hunt_c_users.id = hunt_c_collected_eggs.user_id
WHERE hunt_c_users.id NOT IN ($bannedIDSstr)
GROUP BY hunt_c_users.id
HAVING SUM(hunt_c_collected_eggs.value) > 0
ORDER BY user_points DESC
LIMIT 10
But when I add in another LEFT JOIN on hunt_c_achievements and another SUM(hunt_c_achievements.value) the user_points is wildly inaccurate, and I understand why that's happening (the tables are joining horizontally so the achievements are added on each item), however I don't quite understand how to fix it.
This is the query that is giving me inaccurate results:
SELECT
hunt_c_users.id AS 'id',
CONCAT(first_name, ' ', LEFT(last_name,1), '. From ', city) AS 'user_byline',
fbid AS 'user_fbid',
SUM(hunt_c_collected_eggs.value) + SUM(hunt_c_achievements.value) AS user_points
FROM hunt_c_users
LEFT JOIN hunt_c_collected_eggs ON hunt_c_users.id = hunt_c_collected_eggs.user_id
LEFT JOIN hunt_c_achievements ON hunt_c_users.id = hunt_c_achievements.user_id
WHERE hunt_c_users.id NOT IN ($bannedIDSstr)
GROUP BY hunt_c_users.id
HAVING SUM(hunt_c_collected_eggs.value) > 0
ORDER BY user_points DESC
LIMIT 10
UPDATE
I have added a SQL Fiddle here: http://sqlfiddle.com/#!2/ac1f69/1
My expected result using the dummy-data provided is:
id | user_byline | user_fbid | user_points
------------------------------------------
1033 | ... | ... | 111
1030 | ... | ... | 97
1031 | ... | ... | 62
1032 | ... | ... | 27

Answer 1

You have to use subqueries to calculate the sums separately:
SET #bannedIDSstr = 0;
SELECT
user.id AS 'id',
CONCAT(user.first_name, ' ', LEFT(user.last_name, 1), '. From ', user.city) AS 'user_byline',
user.fbid AS 'user_fbid',
IFNULL(eggs_sum.collected_eggs, 0) + IFNULL(achievement_sum.achievement, 0) AS user_points
FROM hunt_c_users AS user
LEFT JOIN
(SELECT
eggs.user_id,
SUM(eggs.value) AS collected_eggs
FROM hunt_c_collected_eggs AS eggs
GROUP BY eggs.user_id
HAVING collected_eggs > 0
) AS eggs_sum
ON user.id = eggs_sum.user_id
LEFT JOIN
(SELECT
achievements.user_id,
SUM(achievements.value) AS achievement
FROM hunt_c_achievements AS achievements
GROUP BY achievements.user_id
) AS achievement_sum
ON user.id = achievement_sum.user_id
WHERE user.id NOT IN (#bannedIDSstr)
GROUP BY user.id
ORDER BY user_points DESC
LIMIT 10;
DEMO # SQL Fiddle