Hive 中ntile（n）分组函数的使用

数据准备 business 表：：name，orderdate，cost

jack,2017-01-01,10
tony,2017-01-02,15
jack,2017-02-03,23
tony,2017-01-04,29
jack,2017-01-05,46
jack,2017-04-06,42
tony,2017-01-07,50
jack,2017-01-08,55
mart,2017-04-08,62
mart,2017-04-09,68
neil,2017-05-10,12
mart,2017-04-11,75
neil,2017-06-12,80
mart,2017-04-13,94

查询前20%时间的订单信息

select * from (
    select name,orderdate,cost, ntile(5) over(order by orderdate) sorted
    from business
) t
where t.sorted = 1;