Mysql Group By Levels ranking - mysql

Question

rank points player_id quiz_id
1 88 1 40
2 80 3 40
3 30 3 41
4 20 1 41
Getting this output from the following query:
SELECT m.rank,
m.scorer AS points,
m.player_id
FROM
( SELECT d.player_id,
d.scorer, #rownum := #rownum + 1 AS rank
FROM
( SELECT t.player_id,
SUM(t.score) AS scorer
FROM answers t
JOIN PROFILE ON profile.player_id = t.player_id
JOIN quiz ON t.quiz_id = quiz.id
WHERE t.is_active = 1
AND quiz.contest_id = 1
AND profile.signin_source_id != 1
AND profile.is_active = 1
AND t.quiz_id IN (1,
2)
GROUP BY t.player_id
ORDER BY scorer DESC, t.created_utc ASC) d,
(SELECT #rownum := 0) r) m
WHERE m.scorer > 0
However, the output I want is rank for each level separated out.
rank points player_id quiz_id
1 88 1 40
2 80 3 40
1 30 3 41
2 20 1 41
I followed these :
How to perform grouped ranking in MySQL
https://blog.sqlauthority.com/2014/03/09/mysql-reset-row-number-for-each-group-partition-by-row-number/
But can't get the desired output. Any suggestion or help is appreciated.

Answer 1

Try this query, it is simplier IMO:
select #quiz_id_lag := 0, #rank := 1;
select rank, points, player_id, quiz_id from (
select points,
player_id,
case when #quiz_id_lag = quiz_id then #rank := #rank + 1 else #rank := 1 end rank,
#quiz_id_lag,
#quiz_id_lag := quiz_id,
quiz_id
from tbl
order by quiz_id, points desc
) a;
To incorporate this in your query, try:
SELECT #quiz_id_lag := 0, #rank := 1;
SELECT rank,
scorer AS points,
player_id
FROM (
SELECT quiz_id,
player_id,
scorer,
CASE WHEN #quiz_id_lag = quiz_id THEN #rank := #rank + 1 ELSE #rank := 1 END rank,
#quiz_id_lag := quiz_id,
quiz_id
FROM (
SELECT t.player_id,
SUM(t.score) AS scorer,
t.quiz_id
FROM answers t
JOIN PROFILE ON profile.player_id = t.player_id
JOIN quiz ON t.quiz_id = quiz.id
WHERE t.is_active = 1 AND quiz.contest_id = 1 AND profile.signin_source_id != 1
AND profile.is_active = 1 AND t.quiz_id IN (1, 2)
GROUP BY t.player_id
) d
WHERE scorer > 0
ORDER BY quiz_id, scorer DESC
) m

Answer 2

Finally got the desired result, ending up with the query, in order to get proper ranking for level wise:
SELECT m.rank,m.scorer AS points,m.player_id, m.quiz_id FROM (
SELECT d.player_id,d.scorer,
#rownum:= CASE WHEN #quiz_id <> d.quiz_id THEN 1 ELSE #rownum+1 END as rank,
#quiz_id:= d.quiz_id as quiz_id FROM
(SELECT #rownum := 1) r,
(SELECT #quiz_id := 0) c,(
SELECT t.player_id,SUM(t.score) as scorer, t.quiz_id
FROM answers t JOIN profile ON
profile.player_id = t.player_id
JOIN quiz ON t.quiz_id = quiz.id
WHERE t.is_active = 1 AND quiz.contest_id = 2 AND
profile.signin_source_id != 1 AND profile.is_active = 1
GROUP BY t.player_id,t.quiz_id
ORDER BY quiz_id DESC,scorer DESC, t.created_utc ASC) d
) m
WHERE m.scorer > 0 ORDER BY quiz_id
This will give the entire result set for all the levels for a specific group, if want to get the rank for specific levels from a specific group, then do add
AND t.quiz_id IN (1,2)
Thanks to all who ever participated!

Answer 3

Try this
SELECT m.rank,m.scorer AS points,m.player_id, m.quiz_id
FROM (
SELECT d.player_id,d.quiz_id, d.scorer,
#cur:= IF(quiz_id=#id, #cur+1, 1) AS rank,
#id := quiz_id
FROM (
SELECT t.player_id, quiz.id as quiz_id, SUM(t.score) as scorer
FROM answers t JOIN profile ON profile.player_id = t.player_id
JOIN quiz ON t.quiz_id = quize.id
WHERE t.is_active = 1 AND quiz.contest_id = 1
AND profile.signin_source_id != 1 AND profile.is_active = 1
AND t.quiz_id IN (1,2)
GROUP BY t.player_id, quiz.id
ORDER BY scorer DESC
) d, (SELECT #id:=(SELECT MIN(id) FROM quiz), #cur:=0) AS init
order by d.quiz_id, d.scorer desc) m
WHERE m.scorer > 0