ROW_NUMBER

ROW_NUMBER() OVER ([ query_partition_clause ] order_by_clause)

obclient> CREATE TABLE employees(LAST_NAME CHAR(10), SALARY DECIMAL, JOB_ID CHAR(32));
INSERT INTO employees VALUES('JIM', 2000, 'CLEANER');
INSERT INTO employees VALUES('MIKE', 12000, 'ENGINEERING');
INSERT INTO employees VALUES('LILY', 13000, 'ENGINEERING');
INSERT INTO employees VALUES('TOM', 11000, 'ENGINEERING');
COMMIT;
Query OK, 1 row affected

obclient> SELECT LAST_NAME, ROW_NUMBER() OVER(PARTITION BY JOB_ID ORDER BY SALARY) NTL FROM employees;
+-----------+------+
| LAST_NAME | NTL  |
+-----------+------+
| JIM       |    1 |
| TOM       |    1 |
| MIKE      |    2 |
| LILY      |    3 |
+-----------+------+
4 rows in set