Hive实现多表级联统计

有如下访客访问次数统计表 t_access_times

访客	月份	访问次数
A	2015-01	5
A	2015-01	15
B	2015-01	5
A	2015-01	8
B	2015-01	25
A	2015-01	5
A	2015-02	4
A	2015-02	6
B	2015-02	10
B	2015-02	5
……	……	……

需要输出报表：t_access_times_accumulate

访客	月份	月访问总计	累计访问总计
A	2015-01	33	33
A	2015-02	10	43
…….	…….	…….	…….
B	2015-01	30	30
B	2015-02	15	45
…….	…….	…….	…….

实现步骤

可以用一个hql语句即可实现：

select A.username,A.month,max(A.salary) as salary,sum(B.salary) as accumulate from (select username,month,sum(salary) as salary from t_access_times group by username,month) A inner join (select username,month,sum(salary) as salary from t_access_times group by username,month) B on A.username=B.username where B.month <= A.month group by A.username,A.month order by A.username,A.month;