MySQL中的排名函数

MySQL中的排名函数

一种选择是使用排名变量，例如：

SELECt    first_name,          age,          gender,          @curRank := @curRank + 1 AS rankFROM      person p, (SELECT @curRank := 0) rORDER BY  age;

该

(SELECT @curRank := 0)

部分允许变量初始化，而无需单独的

SET

命令。

测试用例：

CREATE TABLE person (id int, first_name varchar(20), age int, gender char(1));INSERT INTO person VALUES (1, 'Bob', 25, 'M');INSERT INTO person VALUES (2, 'Jane', 20, 'F');INSERT INTO person VALUES (3, 'Jack', 30, 'M');INSERT INTO person VALUES (4, 'Bill', 32, 'M');INSERT INTO person VALUES (5, 'Nick', 22, 'M');INSERT INTO person VALUES (6, 'Kathy', 18, 'F');INSERT INTO person VALUES (7, 'Steve', 36, 'M');INSERT INTO person VALUES (8, 'Anne', 25, 'F');

结果：

+------------+------+--------+------+| first_name | age  | gender | rank |+------------+------+--------+------+| Kathy      |   18 | F      |    1 || Jane       |   20 | F      |    2 || Nick       |   22 | M      |    3 || Bob        |   25 | M      |    4 || Anne       |   25 | F      |    5 || Jack       |   30 | M      |    6 || Bill       |   32 | M      |    7 || Steve      |   36 | M      |    8 |+------------+------+--------+------+8 rows in set (0.02 sec)