如何在Hive中使用2进行循环？
我输入的数据如下：
1 a 3
15 b 4
1 b 2
25 a 5
15 c 3
1 a 3
15 c 2
25 b 4
中间输出：对于1个计数，总计a和b，对于15和25相似
1 a 6
1 b 2
15 b 4
15 c 5
25 a 5
25 b 4
最终输出：需要1个最大计数
1 a 6
15 c 5
25 a 5
答案 0 :(得分：0)
您可以使用窗口函数并获取结果。请检查以下内容：
> select * from shailesh;
INFO : OK
+----------------+----------------+----------------+--+
| shailesh.col1 | shailesh.col2 | shailesh.col3 |
+----------------+----------------+----------------+--+
| 1 | a | 3 |
| 15 | b | 4 |
| 1 | b | 2 |
| 25 | a | 5 |
| 15 | c | 3 |
| 1 | a | 3 |
| 15 | c | 2 |
| 25 | b | 4 |
+----------------+----------------+----------------+--+
8 rows selected (0.359 seconds)
> create table shailesh2 as select col1, col2, max(col3s) col3s2 from (select col1,col2,sum(col3) over(partition by col1,col2) col3s from shailesh ) t group by col1, col2;
INFO : OK
+-----------------+-----------------+-------------------+--+
| shailesh2.col1 | shailesh2.col2 | shailesh2.col3s2 |
+-----------------+-----------------+-------------------+--+
| 1 | a | 6 |
| 1 | b | 2 |
| 15 | b | 4 |
| 15 | c | 5 |
| 25 | a | 5 |
| 25 | b | 4 |
+-----------------+-----------------+-------------------+--+
6 rows selected (0.36 seconds)
> select col1, col2, col3s2 from (select col1,col2,col3s2, rank() over(partition by col1 order by col3s2 desc) as rk from shailesh2) t2 where rk=1;
INFO : OK
+-------+-------+---------+--+
| col1 | col2 | col3s2 |
+-------+-------+---------+--+
| 1 | a | 6 |
| 15 | c | 5 |
| 25 | a | 5 |
+-------+-------+---------+--+
3 rows selected (37.224 seconds)