数据库查前三名

首先创建表：

CREATE TABLE score_t(

name 		VARCHAR(10),
subject		VARCHAR(10),
score		INT(10)
);

插入数据:

INSERT INTO score_t VALUES
("张三","java",71),
("李四","java",82),
("王五","java",90),
("赵六","java",98),
("孙七","java",90),
("张三","python",81),
("李四","python",92),
("王五","python",93),
("赵六","python",97),
("孙七","python",70);

思路：
这里只需要先将T2表数据按科目和分数，去重，再查找满足比它分数高的记录数 < 3 的数据即可。
查询各科成绩前三名，前三名都有一个特点，比他们成绩高的人数小于3，成绩就是前三名。

正确写法：

 

 另一种写法：用了limit

select aa.* from ( select DISTINCT name as n1, ( select sum(mark) from te where name=n1 )as g from te t ) aa where aa.g in ( select ta.grade as g from ( select (select sum(mark) from te where name=t1.name )as grade from te t1 GROUP BY grade desc LIMIT 3 ) as ta )

摘自：https://blog.csdn.net/weixin_44497013/article/details/107317719