Question

Im making a browser mafia game, and coding the page where it lists all of the familys / gangs.

Each family has a points rating, made up of the combined SUMs of all its members cash, bullets, exp, etc.

This is my code to loop through to show the family listings:

SELECT 
 (SELECT COUNT(*) FROM players WHERE status='alive' AND family=f.id) as member_count,
 (SELECT SUM(bullets) FROM players WHERE status='alive' AND family=f.id) as sum_bullets,
 (SELECT SUM(cash) FROM players WHERE status='alive' AND family=f.id) as sum_cash,
 (SELECT SUM(exp) FROM players WHERE status='alive' AND family=f.id) as sum_exp,
 (SELECT SUM(killscore) FROM players WHERE status='alive' AND family=f.id) as sum_ks,
 name, id FROM familys f

then during the loop with PHP I work out the total points:

$points = $rs[sum_bullets]/500;
$points = $points + $rs[sum_cash]/10000;
$points = $points + $rs[sum_exp]/1000;
$points = $points + $rs[sum_ks];

Now onto the question. I want to order the results using ORDER BY points DESC. How can I adjust my query to do this?

Answer 1

try to shift logic from application to MySQL to make it faster with a single query as:

SELECT
    (SELECT COUNT(*) FROM players WHERE status='alive' AND family=f.id) as member_count,
    (SELECT SUM(bullets) FROM players WHERE status='alive' AND family=f.id) as sum_bullets,
    (SELECT SUM(cash) FROM players WHERE status='alive' AND family=f.id) as sum_cash,
    (SELECT SUM(exp) FROM players WHERE status='alive' AND family=f.id) as sum_exp,
    (SELECT SUM(killscore) FROM players WHERE status='alive' AND family=f.id) as sum_ks,
    name, id
FROM familys f
ORDER BY (sum_bullets/500 + sum_cash/10000 + sum_exp/1000 + sum_ks);

Edit: for output of total_points

SELECT a.*, (sum_bullets/500 + sum_cash/10000 + sum_exp/1000 + sum_ks) AS total_points
FROM
    (
     SELECT
        (SELECT COUNT(*) FROM players WHERE status='alive' AND family=f.id) as member_count,
        (SELECT SUM(bullets) FROM players WHERE status='alive' AND family=f.id) as sum_bullets,
        (SELECT SUM(cash) FROM players WHERE status='alive' AND family=f.id) as sum_cash,
        (SELECT SUM(exp) FROM players WHERE status='alive' AND family=f.id) as sum_exp,
        (SELECT SUM(killscore) FROM players WHERE status='alive' AND family=f.id) as sum_ks,
        name, id
     FROM familys f
    ) a
ORDER BY (sum_bullets/500 + sum_cash/10000 + sum_exp/1000 + sum_ks) ASC;