Question

I have a MYSQL table like this:

  id |  userid  |  score  |      datestamp      |
-----------------------------------------------------
  1  |    1     |   5     |  2012-12-06 03:55:16
  2  |    2     |   0,5   |  2012-12-06 04:25:21
  3  |    1     |   7     |  2012-12-06 04:35:33
  4  |    3     |   12    |  2012-12-06 04:55:45
  5  |    2     |   22    |  2012-12-06 05:25:11
  6  |    1     |   16,5  |  2012-12-06 05:55:21
  7  |    1     |   19    |  2012-12-06 13:55:16
  8  |    2     |   8,5   |  2012-12-07 06:27:16
  9  |    2     |   7,5   |  2012-12-07 08:33:16
  10 |    1     |   10    |  2012-12-07 09:25:19
  11 |    1     |   6,5   |  2012-12-07 13:33:16
  12 |    3     |   6     |  2012-12-07 15:45:44
  13 |    2     |   4     |  2012-12-07 16:05:16
  14 |    2     |   34    |  2012-12-07 18:33:55
  15 |    2     |   22    |  2012-12-07 18:42:11

I would like to display user scores like this:
if a user on a certain day has more than 3 scores it would get only highest 3, repeat that for every day for this user and then add all days together. I want to display this sum for every user.

EDIT:
So in the example above for user 1 on 06.12. I would add top 3 scores together and ignore 4th score, then add to that number top 3 from the next day and so on. I need that number for every user.

EDIT 2:
Expected output is:

  userid |   score  
--------------------
    1    |    59    //19 + 16.5 + 7 (06.12.) + 10 + 6.5 (07.12.)
    2    |    87    //22 + 0.5 (06.12.) + 34 + 22 + 8.5 (07.12.)
    3    |    18    //12 (06.12.) + 6 (07.12.)

I hope this is more clear 🙂

I would really appreciate the help because I am stuck.

Answer 1

Please take a look at the following code, if your answer to my comment is yes 🙂 Since your data all in 2012, and month of november, I took day.

• SQLFIDDLE sample

Query:

select y.id, y.userid, y.score, y.datestamp 
from (select id, userid, score, datestamp 
      from scores
      group by day(datestamp)) as y    
where (select count(*) 
       from (select id, userid, score, datestamp
             from scores group by day(datestamp)) as x
       where y.score >= x.score
       and y.userid = x.userid
      ) =1 -- Top 3rd, 2nd, 1st    
order by y.score desc
;

Results:

ID  USERID  SCORE   DATESTAMP
8   2       8.5 December, 07 2012 00:00:00+0000
20  3       6   December, 08 2012 00:00:00+0000
1   1       5   December, 06 2012 00:00:00+0000

Based on your latter updates to question.
If you need some per user by year/month/day and then find highest, you may simply add aggregation function like sum to the above query. I am reapeating myself, since your sample data is for just one year, there’s no point group by year or month. That’s why I took day.

select y.id, y.userid, y.score, y.datestamp 
from (select id, userid, sum(score) as score,
      datestamp 
from scores
group by userid, day(datestamp)) as y    
where (select count(*) 
from (select id, userid, sum(score) as score
      , datestamp
from scores
group by userid, day(datestamp)) as x
where y.score >= x.score
and y.userid = x.userid
) =1 -- Top 3rd, 2nd, 1st    
order by y.score desc
;

Results based on sum:

ID  USERID  SCORE   DATESTAMP
1   1       47.5    December, 06 2012 00:00:00+0000
8   2       16      December, 07 2012 00:00:00+0000
20  3       6       December, 08 2012 00:00:00+0000

UPDATED WITH NEW SOURCE DATA SAMPLE

Simon, please take a look at my own sample. As your data was changing, I used mine.
Here is the reference. I have used pure ansi style without any over partition or dense_rank.
Also note the data I used are getting top 2 not top 3 scores. You can change is accordingly.

Guess what, the answer is 10 times simpler than the first impression your first data gave….

SQLFIDDLE

Query to 1:
— for top 2 sum by user by each day

SELECT userid, sum(Score), datestamp
FROM scores t1
where 2 >=
(SELECT count(*) 
 from scores t2
 where t1.score <= t2.score
 and t1.userid = t2.userid
 and day(t1.datestamp) = day(t2.datestamp)
 order by t2.score desc)
group by userid, datestamp 
;

Results for query 1:

USERID  SUM(SCORE)  DATESTAMP
1       70      December, 06 2012 00:00:00+0000
1       30      December, 07 2012 00:00:00+0000
2       22      December, 06 2012 00:00:00+0000
2       25      December, 07 2012 00:00:00+0000
3       30      December, 06 2012 00:00:00+0000
3       30      December, 07 2012 00:00:00+0000

Final Query:
— for all two days top 2 sum by user

SELECT userid, sum(Score)
FROM scores t1
where 2 >=
(SELECT count(*) 
 from scores t2
 where t1.score <= t2.score
 and t1.userid = t2.userid
 and day(t1.datestamp) = day(t2.datestamp)
 order by t2.score desc)
group by userid
;

Final Results:

USERID  SUM(SCORE)
1      100
2      47
3      60

Here goes a snapshot of direct calculations of data I used.