집 >데이터 베이스 >MySQL 튜토리얼 >Row_number() OVER(PARTITION BY xxx ORDER BY XXX)分组排序_MySQL
--//创建一个信息表 CREATE TABLE user_student(id decimal(18,0) identity(1,1),st_name nvarchar(30),class nvarchar(10),score decimal(18,2)) --//插入测试数据============start=================== insert into user_student(st_name,class,score) values('张三','甲','90') insert into user_student(st_name,class,score) values('张四','甲','65') insert into user_student(st_name,class,score) values('张五','甲','88') insert into user_student(st_name,class,score) values('李三','乙','97') insert into user_student(st_name,class,score) values('李四','乙','88') insert into user_student(st_name,class,score) values('李五','乙','78') insert into user_student(st_name,class,score) values('王三','丙','86') insert into user_student(st_name,class,score) values('王四','丙','69') insert into user_student(st_name,class,score) values('王五','丙','59') --//插入测试数据============end=================== select * from user_student --//每个班级分数前两名的学生信息 SELECT ST_NAME,CLASS,SCORE FROM ( SELECT Row_number() OVER(PARTITION BY CLASS ORDER BY SCORE DESC) AS NUM,* FROM user_student ) AS T WHERE NUM<=2