hadoop - 查询以查找最大值

我有下面的数据，我想获取每个ID的最新分区时间



我期望的输出如下

15  10038446  201706060100
19  10103517  201706060100
26  10124464  201706060100
37  1019933 201706052100

如何使用Hive查询来实现？

最佳答案

试试这个

select ID, time
from
(
  select
    ID,
    time,
    row_number() over (partition by ID order by time desc) as time_rank
  from table_name
 ) x
where time_rank = 1
group by ID, time

如果没有子查询(较低的配置单元版本)，则临时表是一种选择。

create table tmp_table as
select
  ID,
  time,
  row_number() over (partition by ID order by time desc) as time_rank
from table_name;

select ID, time
from tmp_table
where time_rank = 1
group by ID, time;

drop table tmp_table;

关于hadoop - 查询以查找最大值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45499961/