1:查看原始数据库information_schema中的表,并显示出VIEWS表的字段结构属性信息
show databases;
use information_schema;
show tables;
show create table VIEWS;
2:创建一个offcn数据库,并创建一个students表,字段为id,name,age,phone,height
create database offcn;
use offcn;
create table student(id int,name varchar(20),age int,phone char(20),heigh
t float(7,2));
3:查看students表的表结构
desc student;
4:在上题创建的students表中,随意插入5条数据
insert into student values(1,'zs',20,'12434569876',1.82);
insert into student values(2,'ls',23,'14434668769',1.79);
insert into student values(3,'ww',34,'13554768768',1.68);
insert into student values(4,'zh',21,'16578468328',1.78);
insert into student values(5,'yz',26,'18647546308',1.88);
5:查询所有创建的数据
select * from student;
6:将students表名修改为students_details
alter table student rename to student_details;
7:将students_details中height字段删除
alter table student_details drop height;
8:在students_details里添加一个新字段,字段名为sex,并增加两条数据。
alter table student_details add sex varchar(20);
insert into student_details (sex) values('man');
insert into student_details (sex) values('woman');
9:删除students_details表
drop table student_details;
10:删除offcn数据库
drop database offcn;