创建表tb_grade，表中添加数据

CREATE DATABASE test;
use test;
create table tb_grade(id int(3),name varchar(10),grade int(3));

insert into tb_grade(id,name,grade) values(1,'guanyu',85),(2,'liubei',80),(3,'zhangfei',90),(4,'caocao',100);

SELECT * FROM tb_grade;