Order and sort result mysql or using php array funciton

Question

I have a table "student_points".

id    user_id     points   subject_id      
 1      10         45           22
 2      11         75           23
 3      12         78           24
 4      10         13           23
 5      12         65           23

and so on ...

This table contain about 1000 records of users and points. I want 10 records based on points (Max points first) So I can use mysql query as

Select * from student_points order by points limit 0,10

Now the requirement is that we need to group these 10 records based on user_id For example in first 10 records three are 3 students records so they should display in group. End result should be like

   id    user_id     points    subject_id  
    3      12         78           24
    5      12         65           23
    1      10         45           22
    4      10         13           23
    2      11         75           23

You can see that first record is based on most point and it student id is 12, now they are group according to user_id.

I tried two order by . I also tried to array_multisort after getting result but both are not working properly.

Please suggest any way, Either mysql query or group after getting result.

Thanks

Answer 1

This should work just add a limit to whatever number you want to limit by

select sp.id, sp.user_id, sp.points 
from student_points sp
join (select user_id, max(points) as sort_by from student_points group by user_id) sort_table on sp.user_id = sort_table.user_id
order by sort_table.sort_by desc, sp.user_id, sp.points desc;

Answer 2

To get your required result I have written the query :

SELECT * FROM (
    Select * from student_points order by points limit 0,10
) As st
GROUP BY user_id,subject_id
ORDER BY points DESC

Please try this. Let me know if this is not work for you.

Answer 3

I guess you need to wrap up your query in a subquery and later sort the results based on user_id and points .

SELECT * FROM 
(
  Select * from student_points order by points limit 0,10
) AS t
ORDER BY 
  t.user_id DESC, 
  t.points DESC