一.整排

要求:根据score进行排名,分数相同,名次相同,且连续

表如下图:

 

 

 sql语句:

方法一:
select
a.score, (select count(distinct b.score) from test01 b where b.score >=a.score) as rank1 from test01 a order by score desc;

结果如下图:

方法二:
select score,dense_rank() over(order by score desc) rank2 from test01

结果如下图:

 

 

 注意:重新命名时不要使用rank,会报错

二.分组后排序

要求:每一门课的最高两名

表:test01

方法一:

select *
from
(
select
subject,score,
@ROW:=case when @su=subject then @ROW+1 else 1 end rn,
@su:=subject
from
(select subject,score from test01 order by subject,score desc) t1,
(select @ROW:=0, @su:=\’\’) t2
)t3
where rn<=2

注意:@ROW:=是用来赋值的

结果如下图:

方法二:

select *
from
(select subject,score,row_number() over(partition by subject order by score desc) rn from test01) t
where t.rn <=2

结果如下图:

 

 

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