DENSE_RANK
Description
DENSE_RANK() is a window function used to calculate rankings within a group. Unlike RANK(), DENSE_RANK() returns consecutive rankings without gaps. The ranking values start from 1 and increment sequentially. When there are identical values, they will receive the same rank.
Syntax
DENSE_RANK()Return Value
Returns a BIGINT type ranking value, starting from 1.
Examples
select x, y, dense_rank() over(partition by x order by y) as rank from int_t;+-----+-----+------+
| x | y | rank |
| --- | --- | ---- |
| 1 | 1 | 1 |
| 1 | 2 | 2 |
| 1 | 2 | 2 | -- Same values receive the same rank |
| 2 | 1 | 1 |
| 2 | 2 | 2 |
| 2 | 3 | 3 | -- Rankings are consecutive, no gaps |
| 3 | 1 | 1 |
| 3 | 1 | 1 |
| 3 | 2 | 2 |
+-----+-----+------+