HIVE分组排序问题

 

答案：

hive> select *,row_number() over (partition by product_no order by start_time desc) from table1;

 

 

知识点：

1、row_number

1. hive (test)> select *, row_number() over (partition by sub order by score) as od from t; 

 

2、rank

1. hive (test)> select *, rank() over (partition by sub order by score) as od from t; 

 

3、dense_ran

1. hive (test)> select *, dense_rank() over (partition by sub order by score desc) from t;

 

业务实例：

统计每个学科的前三名

1. select * from (select *, row_number() over (partition by sub order by score desc) as od from t ) t where od<=3;

语文成绩是80分的排名是多少

1. hive (test)> select od from (select *, row_number() over (partition by sub order by score desc) as od from t )t where sub=‘chinese‘ and score=80;

分页查询

1. hive (test)> select * from (select *, row_number() over () as rn from t) t1 where rn between 1 and 5;

转载于:https://www.cnblogs.com/duking1991/p/6126745.html