#1. 创建数据库test01_office,指明字符集为utf8。并在此数据库下执行下述操作
#2. 创建表dept01
/*
字段类型
id INT(7)
NAME VARCHAR(25)
*/
#3. 将表departments中的数据插入新表dept02中
#4. 创建表emp01
/*
字段类型
id INT(7)
first_name VARCHAR (25)
last_name VARCHAR(25)
dept_id INT(7)
*/
#5. 将列last_name的长度增加到50
#6. 根据表employees创建emp02
#7. 删除表emp01
#8. 将表emp02重命名为emp01
#9.在表dept02和emp01中添加新列test_column,并检查所作的操作
#10.直接删除表emp01中的列department_id
create database test01_office character set utf8;
create table dept01(
id int(7),
name varchar(25),
);
create table dept02
as
select *
from departments;
create table emp01(
id int(7),
first_name varchar(25),
last_name varchar(25),
dept_id int(7)
);
alter table emp01
modify last_name varchar(50);
create table emp02
as
select *
from employees;
drop table emp01;
rename table emp02 to emp01;
alter table dept01, emp01
add test_column;
alter table emp01
drop column department_id;