--//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','') insert into user_student(st_name,class,score)
values('张四','甲','') insert into user_student(st_name,class,score)
values('张五','甲','') insert into user_student(st_name,class,score)
values('李三','乙','') insert into user_student(st_name,class,score)
values('李四','乙','') insert into user_student(st_name,class,score)
values('李五','乙','') insert into user_student(st_name,class,score)
values('王三','丙','') insert into user_student(st_name,class,score)
values('王四','丙','') insert into user_student(st_name,class,score)
values('王五','丙','')
--//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

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" alt="" />                   输出结果:aaarticlea/png;base64,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" alt="" />

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