RANK 函数基于 OVER 子句中的 ORDER BY 表达式确定一组值的排名。当有相同排序值时，将会有相同的排名，并且值相同的行数会被记录到下个排名中。

语法

RANK()  OVER ( [ PARTITION BY expr_list ] [ ORDER BY order_list ])

参数

示例

建表 course，并向 name 和 grade 列插入数据，执行以下语句：

CREATE TABLE course
(
  name VARCHAR(8),
  grade NUMBER
);
INSERT INTO course VALUES('Linda',50);
INSERT INTO course VALUES('Tan',85);
INSERT INTO course VALUES('Tom',90);
INSERT INTO course VALUES('John',95);
INSERT INTO course VALUES('Mery',55);
INSERT INTO course VALUES('Peter',60);
INSERT INTO course VALUES('Jack',65);
INSERT INTO course VALUES('Rose',70);
INSERT INTO course VALUES('Tonny',75);
INSERT INTO course VALUES('Apple',80);
COMMIT;

执行以下语句：

SELECT name,grade ,RANK() over(ORDER BY grade DESC) FROM course;

查询结果如下：

+-------+-------+------------------------------+
| NAME  | GRADE | RANK()OVER(ORDERBYGRADEDESC) |
+-------+-------+------------------------------+
| John  |    95 |                            1 |
| Tom   |    90 |                            2 |
| Tan   |    85 |                            3 |
| Apple |    80 |                            4 |
| Tonny |    75 |                            5 |
| Rose  |    70 |                            6 |
| Jack  |    65 |                            7 |
| Peter |    60 |                            8 |
| Mery  |    55 |                            9 |
| Linda |    50 |                           10 |
+-------+-------+------------------------------+