rank,dense_rank,row_number,ntile 的比对和使用场景

1,a,10
2,a,12
3,b,13
4,b,12
5,a,14
6,a,15
7,a,13
8,b,11
9,a,16
10,b,17
11,a,14

create table t_ntile(id int,name string,sal int)
row format delimited
fields terminated by ',';

load data local inpath '/root/txt/t_ntile.txt' into table t_ntile;

select id,name,sal
,rank() over(partition by name order by sal desc) rank
,dense_rank() over(partition by name order by sal desc)dense
,row_number() over(partition by name order by sal desc)row_number
from t_ntile;

select * from (
select id,name,sal
,rank() over(partition by name order by sal desc) rank
,dense_rank() over(partition by name order by sal desc)dense
,row_number() over(partition by name order by sal desc)row_number
,count(*) over(partition by name) * 0.5 as count
from t_ntile
)t where t.rank <= t.count;

select * from (
select id,name
,sal
,ntile(2) over(partition by name order by sal desc)n2
,sal
,ntile(3) over(partition by name order by sal desc)n3
from t_ntile
)t where t.n2 = 1;