题解 | #考试分数(三)#
考试分数(三)
http://www.nowcoder.com/practice/b83f8b0e7e934d95a56c24f047260d91
select id,name,score
from (select g.id,name,score,
dense_rank()over(partition by language_id order by score desc) rk
from grade g left join language l
on g.language_id = l.id)a
where rk <= 2
order by name,score desc,id;
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