First three Groups with Highest Marks should have specific points

Question

my table

+------+-------+---------+-------+--------+
| Name | Group1| Section | Marks | Points |
+------+-------+---------+-------+--------+
| S1   | G1             


        

Answer 1

I have found a solution to list the groups with their allocated points but I was having a hard time storing the result back into myTable, i.e. doing an UPDATE on the table. I managed at last (see bottom of post!!).

But first, here is the group score-table generator (group overview):

SELECT mg,ms,mm,
  CASE WHEN @s=ms THEN 
    CASE WHEN @m=mm THEN @i 
         WHEN @i>2 THEN @i:=@i-2 
         ELSE null END
  ELSE @i:=5 END pt,
  @g:=mg gr,@s:=ms,@m:=mm 
FROM (
  SELECT group1 mg,section ms,max(marks) mm FROM mytable
  WHERE group1>''
  GROUP BY group1,section
) m 
ORDER BY ms,mm desc,mg

http://sqlfiddle.com/#!2/bea2a2/1

It gives me this list:

|  MG |     MS | MM |     PT |  GR | @S:=MS | @M:=MM |
------------------------------------------------------
|  G1 | class1 | 55 |      5 |  G1 | class1 |     55 |
| G10 | class1 | 55 |      5 | G10 | class1 |     55 |
|  G5 | class1 | 32 |      3 |  G5 | class1 |     32 |
|  G8 | class1 | 22 |      1 |  G8 | class1 |     22 |
|  G9 | class1 | 20 | (null) |  G9 | class1 |     20 |
| G66 | class2 | 66 |      5 | G66 | class2 |     66 |
| G88 | class2 | 65 |      3 | G88 | class2 |     65 |
|  G4 | class2 | 60 |      1 |  G4 | class2 |     60 |
| G55 | class2 | 33 | (null) | G55 | class2 |     33 |

I am back (26.08.2013, after having asked for help myself, see here) and can now provide the full answer:

SET @s:=@m:=@i:='a'; -- variables *MUST* be "declared" in some
                     -- way, otherwise UPDATE will not work!

UPDATE mytable INNER JOIN 
(SELECT mg,ms,mm,
   CASE WHEN @s=ms THEN 
     CASE WHEN @m=mm THEN @i 
          WHEN @i>2 THEN @i:=@i-2 
          ELSE null END
   ELSE @i:=5 END pt,
   @s:=ms,@m:=mm 
 FROM (
   SELECT group1 mg,section ms,max(marks) mm FROM mytable
   WHERE group1>''
   GROUP BY group1,section
 ) m 
 ORDER BY ms,mm desc,mg
) t ON mg=group1 AND ms=section AND mm=marks
SET Points=pt

see here http://sqlfiddle.com/#!2/bb7f2

And finally - off-topic:

Dear user @user2594154, why have you bombarded this board with the same question 8 times?!?

• Add specific points on highest marks Find sum of points and grouping
• First three Groups with Highest Marks should have specific points (this post)
• Grouping results by name and points Group each Sections by Points and
• CompetitionName descending order Find highest points of two students
• in a section Display 3 Maximum values of a Column, include duplicate
• values with condition First three Groups with Highest Marks should
• have specific points 5,3, 1 [duplicate]

It would be much more helpful for everybody if you had kept your question in one post, explaining exactly what you want and also what you have tried yourself (!!). Then, in the course of the answering process, it is possible to edit it, making it more precise. New questions should only be posted, if their subject is actually different, see here.

No hard feelings - I learnt a lot in the process of solving this problem of yours. ;-)