calculating player statistics from database - mysql

Question

i have the following tables.
i want to fetch all the player statistics record from the given tables, the records of individual player includes.
Player Name
Position
Total Number of games played
Number of goals scored
Total number of assist for goals.
Total Points (total goals + total assist = total points).
after trying i came up with this query
SELECT SQL_CALC_FOUND_ROWS
CONCAT(u.first_name, ' ', u.last_name) as player_name,
p.position,
COUNT(g.id)
FROM
gce_player p
LEFT JOIN
gce_user u ON(u.id = p.user_id)
LEFT JOIN
gce_game_team_lineup gtl ON(gtl.player_id = p.id)
LEFT JOIN
gce_game_team gt ON(gt.id = gtl.game_team_id)
LEFT JOIN
gce_game_goal gg ON(gg.player_id = p.id)
LEFT JOIN
gce_game g ON(g.id = gt.game_id)
GROUP BY p.id
ORDER BY p.id asc
the above query returns me proper record till total number of games played, i am facing issue fetching the proper records after this, ill appreciate any kind of help on this.
here is the link to sqlfiddle if you want to look at the schema, i have added some test data too.
thank you.
UPDATE :
here are few of the rules to remember.
Number of goals scored = total number of goals scored by a player. for example if in gce_game_goal table there are 10 rows which have
the value of player_id as 4 it means the player have scored 10 goals
and i need to fetch this record for individual player, and
likewise if there are 7 rows in which player_id have value of 3 this
means player with id 3 have scored 7 goals and likewise.
Total number of assist for goals = total number of assist given to a goalie by a player (assist is like a pass in football). i need to
calculate total number of assist or pass that was done by a user.
for each goal there will be two assist, and each assist are players
who pass the ball to a golaie. i want to count the number of passes
or assist given by a player. for example if in gce_game_goal
table there are 8 rows or records that have the value of 3 in either
assis1_id or assist2_id column, this means player with id 3 have
scored 8 assist in total
.
kindly let me know if you still have any doubts/question, ill try to improve my question
Thanks

Answer 1

The problem that you are facing is caused by aggregating along multiple different dimensions of the data (say by game and by goal). This results in a cross product for each player.
A fairly general solution is to do aggregations in the from clause, along each dimension. Each variable (or perhaps a few variables) comes from a different aggregation:
select u.last_name, u.first_name, p.position,
pg.goals, pg.assists, (pg.goals + pg.assists) as TotalPoints
from gce_player p join
gce_user u
on p.user_id = u.id left outer join
(select player_id, SUM(goal) as goals, SUM(assist) as assists
from ((select player_id, 1 as goal, 0 as assist
from gce_game_goal
) union all
(select assist1_id, 0 as goal, 1 as assist
from gce_game_goal
) union all
(select assist2_id, 0 as goal, 1 as assist
from gce_game_goal
)
) t
group by player_id
) pg
on pg.player_id = p.id left outer join
(select gtl.player_id, count(*) as NumTeams
from gce_game_team_lineup gtl join
gce_game_team gt
on gtl.id = gt.team_id
) g
on g.player_id = p.id

Answer 2

Try this
SELECT
CONCAT(u.first_name, ' ', u.last_name) as player_name,
count(g.id) as Goals,
(select
count(*)
from
gce_game_goal
where
assist1_id = p.player_id)
+(select
count(*)
from
gce_game_goal
where
assist2_id = p.player_id) as Assists,
count(g.id)
+ (select
count(*)
from
gce_game_goal
where
assist1_id = p.player_id)
+ (select
count(*)
from
gce_game_goal
where
assist2_id = p.player_id) as Total
FROM
gce_player as p
LEFT JOIN
gce_game_goal as g ON p.id = g.player_id
LEFT JOIN
gce_user u ON(u.id =p.user_id)
GROUP BY p.player_id