hive函数row_number、rank和dense_rank的对比

不讲别的，直接看结果

select 
    score,
    row_number() over (order by score desc) as `row_number`,
    rank()       over (order by score desc) as `rank`,
    dense_rank() over (order by score desc) as `dense_rank`
from 
(
    select 100 as score union all
    select 95  as score union all
    select 95  as score union all
    select 90  as score
) t;

+--------+-------------+-------+-------------+
| score  | row_number  | rank  | dense_rank  |
+--------+-------------+-------+-------------+
| 100    | 1           | 1    | 1           |
| 95     | 2           | 2    | 2           |
| 95     | 3           | 2    | 2           |
| 90     | 4           | 4    | 3           |
+--------+-------------+-------+-------------+