Hive實現多表級聯統計
阿新 • • 發佈：2018-12-29
有如下訪客訪問次數統計表 t_access_times
| 訪客 |
月份 |
訪問次數 |
| 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 |
| …… |
…… |
…… |
需要輸出報表：t_access_times_accumulate
| 訪客 |
月份 |
月訪問總計 |
累計訪問總計 |
| A |
2015-01 |
33 |
33 |
| A |
2015-02 |
10 |
43 |
| ……. |
……. |
……. |
……. |
| B |
2015-01 |
30 |
30 |
| B |
2015-02 |
15 |
45 |
| ……. |
……. |
……. |
……. |
實現步驟
可以用一個hql語句即可實現：
| 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; |