MYSQL的知识点

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打开mysql服务

net start mysql

关闭mysql服务

net stop mysql

1.mysql基础表操作

创建/删除数据库（数据库名test）

create database test;

drop datebase if exists test;

显示数据库

show databases;

进入test数据库

use test;

查看test数据库中的表

show tables;

创建表（表明为person）

create table person(varchar(20) name,int age,varchar sex);

删除表

drop table if exists person;

删除表中所有数据，保存表结构

delete from person;

查询person表，

select * from person;

select name from person where age = 20;

select count(*) from person;

修改表名

alter table person rename student;

向person表插入数据

insert into person(name,age,sex) values('zhangshan',22,'男');

删除表中某一项

delete from person where name = 'zhangshan' ;

修改表中数据

update person set name = 'wangwu' where name = 'zhangshan';

显示数据表结构

desc person;

2.用户管理

创建用户

create user 'username'@'host' identified by 'password'; 

insert into mysql.user(Host,User,Password) values("localhost","username",password("password"));

查看已创建的用户

select user，host from user；

删除用户

drop user 'username'@'host';

修改用户

rename user 'username'@'host' to 'newusername'@'newhost';

修改用户密码

set password for 'username'@'host' = password('newpassword');

给用户授权/撤权

grant/revoke select, insert on test.person TO 'username'@'host';

grant/revoke all on *.* to 'username'@'host' ;

给用户授用户管理权限（可以给其他人授权）

grant privileges on test.person to 'username'@'host' with grant option ;

授予所有数据库的操作权限

grant select,delete,update,drop,create on *.* to 'username'@'host' identified by 'password'; 

grant all on *.* to 'username'@'host' identified by 'password';

设置用户密码

set password for 'username'@'host' = password('newpassword');

如果是当前用户设置密码

set password = password('newpassword');