mySQL--找出各科最高成绩

Posted 2020-10-13 L伟铭

//找出各科最高成绩
create table gradeMax(
id int primary key auto_increment,
name varchar(20),
subject varchar(20),
grade int
);

insert into gradeMax(name ,subject ,grade ) values
(\'小点\',\'java\',99),
(\'小黑\',\'.net\',100),
(\'小军\',\'职业素养\',100),
(\'小王\',\'语文\',78),
(\'小憋\',\'数学\',96),
(\'小丽\',\'英语\',87);

select * from gradeMax
where GRADE =(select max(grade) from gradeMax where name=name);

select subject,max(grade),min(grade),sum(grade),avg(grade),count(grade) from gradeMax group by subject;

主要：
select * from gradeMax where grade in(select max(grade) from gradeMax group by subject);

select * from gradeMax where subject,grade in gradeMax ;