Hive求每一年最大气温的那一天 + 温度

create table t_wendu_line(
line string
);
load data local inpath ‘/root/wendu.txt‘ into table t_wendu_line;
求每一年最大气温的那一天 + 温度
临时数据存放在视图中
create view v_temperature_data
as
select substr(line,1,4) as year,
from_unixtime(unix_timestamp(substr(line,1,8),‘yyyymmdd‘),‘yyyy-mm-dd‘) tdate
,cast(substr(line,9,2) as smallint) as temperature_num
from t_wendu_line;

select year,tdate,temperature_num
from (
select year,tdate,temperature_num,
row_number() over(partition by year order by temperature_num desc ) as rn
,rank() over(partition by year order by temperature_num desc ) as rn1
,dense_rank() over(partition by year order by temperature_num desc ) as rn2
from v_temperature_data
) tmp
where tmp.rn = 1;

2001 2001-01-02 12
2007 2007-01-10 23
2008 2008-01-02 16
2010 2010-01-02 16
2012 2012-01-10 23
2013 2013-01-10 23
2014 2014-01-02 16
2015 2015-01-06 49

Hive求每一年最大气温的那一天 + 温度

原文：http://blog.51cto.com/6000734/2321085