求答案急！来个hao人做个题

1 create database student;

2 create database teacher;

3 show databases;

4 use student;

  create table xuesheng(xuehao varchar(20) primary key,xingming varchar(10)....);

5 alter table xuesheng add column qq varchar(15);

6 alter table xuesheng drop column qq;

7 drop database teacher;

8 use student;

  drop table xuesheng;