OceanBase PERCENT_RANK

PERCENT_RANK( ) OVER ([query_partition_clause] order_by_clause)

CREATE TABLE course_rank
(
  name VARCHAR(8),
    id NUMBER
);
INSERT INTO course_rank VALUES('Linda',1);
INSERT INTO course_rank VALUES('Tan',2);
INSERT INTO course_rank VALUES('Tom',3);
INSERT INTO course_rank VALUES('John',4);
INSERT INTO course_rank VALUES('Mery',5);
COMMIT;

SELECT name, id ,percent_rank() OVER (ORDER BY id) AS pr1 FROM course_rank;

+-------+------+------+
| NAME  | ID   | PR1  |
+-------+------+------+
| Linda |    1 |    0 |
| Tan   |    2 |  .25 |
| Tom   |    3 |   .5 |
| John  |    4 |  .75 |
| Mery  |    5 |    1 |
+-------+------+------+