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ROW_NUMBER
Ranking function. Returns the number of the current row within its partition.
Syntax
ROW_NUMBER () OVER (
[PARTITION BY (col | expr), ...]
[ORDER BY (col | expr), ...]
)
Return Type
An integer
Examples
create table example (a int, b int);
insert into example values(1,2),(2,2),(3,3),(4,3);
select a,b, row_number() over() from example;
+------+------+---------------------+
| a | b | row_number() over() |
+------+------+---------------------+
| 1 | 2 | 1 |
| 2 | 2 | 2 |
| 3 | 3 | 3 |
| 4 | 3 | 4 |
+------+------+---------------------+
select a,b, row_number() over(partition by b order by a desc) from example;
+------+------+---------------------------------------------------+
| a | b | row_number() over(partition by b order by a desc) |
+------+------+---------------------------------------------------+
| 2 | 2 | 1 |
| 1 | 2 | 2 |
| 4 | 3 | 1 |
| 3 | 3 | 2 |
+------+------+---------------------------------------------------+
