complex join query in mysql - mysql

Question

Hy everyone,
I really need your help. I have to obtain the list (distinct) of all users who :
- have a live checkin ( checkins.ctype = 'live' ) in a match
- where they favorite team ( see fanusers_teams )
- won by 3 ore more goals difference.
The favorite team, could be info_matches.team_id1 OR info_matches.team_id2 or even both.
Here is a small design for the involved tables :
What I've tried, works 80% (so it doesn't :( ) because it returns some users correct (they fav. teams by 3+ goals diff) , but also returns users which don't have a fav. team in the situation. I think that they are returned because they've made a live checkin for a match where one team or the other has won by a 3+ goals diff.
Here is my query :
SELECT DISTINCT
f.id
FROM
fanusers f
LEFT JOIN
checkins c ON f.id = c.fanuser_id
LEFT JOIN
info_matches m ON m.id = c.match_id
WHERE
c.ctype = 'live' AND
(
m.team_id1 IN(
SELECT DISTINCT
m1.team_id1
FROM
info_matches m1
RIGHT JOIN
fanusers_teams ft ON m1.team_id1 = ft.team_id
RIGHT JOIN
fanusers f ON f.id = ft.fanuser_id
WHERE
m1.pointsteam1 - m1.pointsteam2 >= 3
)
OR
m.team_id2 IN(
SELECT DISTINCT
m2.team_id2
FROM
info_matches m2
RIGHT JOIN
fanusers_teams ft ON m2.team_id2 = ft.team_id
RIGHT JOIN
fanusers f ON f.id = ft.fanuser_id
WHERE
m2.pointsteam2 - m2.pointsteam1 >= 3
)
)
I would appreciate also a small explanation regarding what am I doing wrong, if there is someone who succeed to solve this query.
Thanks.

Answer 1

Something like this should work:
SELECT DISTINCT f.id
FROM fanusers f
JOIN checkins c
ON f.id = c.fanuser_id
JOIN fanusers_teams ft
ON f.id = ft.fanuser_id
JOIN info_matches m
ON m.id = c.match_id
AND
(
(ft.team_id = m.team_id1 AND pointsteam1 - pointsteam2 >= 3)
OR
(ft.team_id = m.team_id2 AND pointsteam2 - pointsteam1 >= 3)
)
WHERE c.ctype = 'live'

Answer 2

I've found also a way to solve the query, but not so nice as Tom did it.
My way :
SELECT DISTINCT
f.id AS user_id
FROM
fanusers f
LEFT JOIN
checkins c ON f.id = c.fanuser_id
LEFT JOIN
info_matches m ON m.id = c.match_id
WHERE
c.ctype = 'live'
AND
m.matchisfinished = 1
AND
c.fanuser_id NOT IN ( SELECT DISTINCT
f1.id
FROM
fanusers f1
LEFT JOIN
fanusers_stickers fs
ON f1.id = fs.fanuser_id
WHERE
fs.sticker_id = 35
)
AND
(
( m.team_id1 IN ( SELECT DISTINCT
ft.team_id
FROM
fanusers_teams ft
INNER JOIN
checkins c1
ON
ft.fanuser_id = c1.fanuser_id
WHERE
f.id = c1.fanuser_id
)
AND
m.pointsteam1-m.pointsteam2>=3
)
OR
(
m.team_id2 IN ( SELECT DISTINCT
ft.team_id
FROM
fanusers_teams ft
INNER JOIN
checkins c1
ON
ft.fanuser_id = c1.fanuser_id
WHERE
f.id = c1.fanuser_id
)
AND
m.pointsteam2-m.pointsteam1>=3
)
)
So for the moment, even if I'm happy that I've solved the query by myself, I will use Tom's query :).