1.MySQL数据库系统

1.创建数据库bdqn_个人名

       mysql -u root

       create database bdqn_lzh；

       use bdqn_lzh

2.创建包含姓名，性别，住址，成绩列表，表名为个人姓名，姓名为主键，住址不能为空 

       mysql> create table lizhanhua

    -> (xingming char(20) primary key,

    -> xingbie char(10),

    -> zhuzhi varchar(50) not null,

-> chengjiliebiao decimal(5,2));

3.个人表添加五条记录,添班级同学

       mysql> insert into lizhanhua values('fengyongqi','nan','shanxisheng','1');

       mysql> insert into lizhanhua values('gaoxin','nan','shanxisheng','88');

       mysql> insert into lizhanhua values('zhangzihang','nan','shanxisheng','90');

       mysql> insert into lizhanhua values('haohongqi','nan','shanxisheng','2');

       mysql> insert into lizhanhua values('cuitiantai','nan','shanxisheng','50');

4.查询表中成绩大于80分的同学

       mysql> select * from lizhanhua where chengjiliebiao>80;

5.授权你的同桌可以访问你的表

       mysql> grant select on auth.* to 'yongqi'@'localhost' identified by '123456';

       exit

       mysql -u yongqi -p

6.授予你自己可以修改和插入数据的权限

       exit

       mysql -u root

       grant insert,update on bdqn_lzh.lizhanhua to lzh@localhost；

7.授予小明只能在192.168.1.0/24客户端上查询

       grant select on bdqn_lzh.lizhanhua to xiaoming@'192.168.1.%';

       show grants for 'xiaoming'@'192.168.1.%';