在最高分上添加特定点

Question

我想在最高分上添加积分.我的桌子是

我试图给出学生最高3分的积分.第一名最高分为5分,第二高分为3分,第三高分为1分

我使用此代码选择最高标记,

select t1.ID, t1.Name, t1.Section, t1.Marks from myTable t1 join 
(select Section, substring_index(group_concat
 (distinct Marks order by Marks desc), ',', 3) as Marks3  
 from myTable group by Section ) tsum  on t1.Section = tsum.Section 
  and find_in_set(t1.Marks, tsum.Marks3) > 0 ORDER BY Section, Marks DESC, ID Desc

我想为第一高分值增加5分,第二高分为3分,第三高分为1分.学生可能会出现重复标记.

请参阅http://www.sqlfiddle.com/#!2/dca0c/1

所以我的最终输出

请帮我..

Answer 1

select t1.ID, t1.Name, t1.Section, t1.Marks, 
case ((SELECT COUNT(distinct MARKS) FROM students t2 WHERE t2.marks > t1.marks
and t1.Section = t2.Section) +1) when 1 then 5 when 2 then 3 else 1 end as Points
from students t1 join
     (select Section, substring_index(group_concat(distinct Marks order by Marks desc), ',', 3) as Marks3
      from students
      group by Section
     ) tsum
     on t1.Section = tsum.Section and
        find_in_set(t1.Marks, tsum.Marks3) > 0
ORDER BY Section, Marks DESC, ID ASC;

输出：完全按照您的要求。;)

ID  NAME    SECTION MARKS   POINTS
1   S1  class1  55  5
7   S7  class1  32  3
3   S3  class1  25  1
10  S10 class2  78  5
14  S14 class2  78  5
6   S6  class2  66  3
2   S2  class2  33  1
13  S13 class2  33  1
4   S4  class3  65  5
11  S11 class3  65  5
5   S5  class3  43  3
12  S12 class3  43  3
15  S15 class3  25  1

小提琴