Mysql-------查詢各科成績前三名的記錄

查詢各科成績前三名的記錄

分析如下:

 

select s.* from (select distinct Student.*,a.c_id, a.s_score, count( distinct b.s_score)+1 as rank
from Score a  
left join  Score b  on a.c_id=b.c_id  and a.s_score<b.s_score
left join Student on(a.s_id=Student.s_id)
group by a.c_id, a.s_id
order by a.c_id, a.s_score desc) s
where s.rank between 1 and 3;