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DENSE_RANK
Ranking function. Returns the rank of the current row within the partition as specified by the order by clause. If two or more rows tie they have the same ranking. The difference between RANK and DENSE_RANK is that DENSE_RANK does not skip values after a tie.
Syntax
DENSE_RANK () OVER (
[PARTITION BY (col | expr), ...]
[ORDER BY (col | expr), ...]
)
Return Type
Integer
Examples
memsql> create table example (a int, b int);
memsql> insert into example values(1,2),(2,2),(3,3),(4,3);
memsql> select a,b, dense_rank() over(order by b) from example;
+------+------+-------------------------------+
| a | b | dense_rank() over(order by b) |
+------+------+-------------------------------+
| 1 | 2 | 1 |
| 2 | 2 | 1 |
| 3 | 3 | 2 |
| 4 | 3 | 2 |
+------+------+-------------------------------+
