MySQL-创建数据库/数据表

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;