一、基于自己创建表的操作1：创建一张学生表student，拥有stuid,stuname,sex,三个字段，其中stuid为主键。create table student( stuid int primary key, stuname VARCHAR(20), sex VARCHAR(20)2：为该表增加一个新列score。alter table student add(score varchar(10);3：修改该表score列名为stuscore。alter table student rename column score to stuscoree;4：为student表插入5条记录。insert into student values(1,张三丰,男,80);insert into student values(2,阿悄,女,70);insert into student values(3,陈龙,男,90);insert into student
