sql实现分组排序-实例分别获取男女成绩前三名的学生姓名

表scores (name,sex,score),分别获取男女前三名学生姓名。

建立表格：

create table scores (
 name varchar2(8),sex varchar2(1),score number(3,0)
  ) 

插入学生成绩

  insert into scores(name,sex,score) values ('男A','1',100);
  insert into scores(name,sex,score) values ('男B','1',90);
  insert into scores(name,sex,score) values ('男C','1',80);
  insert into scores(name,sex,score) values ('男D','1',70);
  insert into scores(name,sex,score) values ('女A','2',100);
  insert into scores(name,sex,score) values ('女B','2',90);
  insert into scores(name,sex,score) values ('女C','2',80);
  insert into scores(name,sex,score) values ('女D','2',70);

查询：

SELECT name, sex,score
   FROM (SELECT name,
                sex,
                score,
                ROW_NUMBER() OVER(PARTITION BY sex ORDER BY score DESC) RW
           FROM scores)
 WHERE RW < 4

运行结果：

1 男A 1 100
2 男B 1 90
3 男C 1 80
4 女A 2 100
5 女B 2 90
6 女C 2 80