MysqL 创建一个用户 hail，密码 hail，指定一个数据库 haildb 给 hail

-- 512.笔记 jb51.cc
  MysqL -u root -p
  password
  use MysqL;
  insert into user(host,user,password) values('localhost','hail',password('hail'));
  flush privileges;
  create database haildb;
  grant all privileges on haildb.* to hail@localhost identified by 'hail';
  flush privileges;

如果想指定部分权限给用户

-- 512.笔记 jb51.cc
  grant select,update on haildb.* to hail@localhost identified by 'hail';
  flush privileges;

删除用户

-- 512.笔记 jb51.cc
  delete from user where user='hail' and host='localhost';
  flush privileges;

删除用户数据库

-- 512.笔记 jb51.cc
drop database haildb;

修改指定用户密码

-- 512.笔记 jb51.cc
  update user set password=password('new_password') where user='hail' and host='localhost';
  flush privileges;

1.远程登录MysqL

-- 512.笔记 jb51.cc
MysqL -h ip -u root -p 密码

2.创建用户

格式：grant 权限 on 数据库.* to 用户名@登录主机 identified by “密码”;

例1：增加一个test1用户，密码为123456，可以在任何主机上登录，并对所有数据库有查询，增加，修改和删除的功能。需要在MysqL的root用户下进行

-- 512.笔记 jb51.cc
  MysqL>grant select,insert,update,delete on *.* to test1@"%" identified by "123456";
  MysqL>flush privileges;

例2：增加一个test2用户，密码为123456，只能在192.168.2.12上登录，并对数据库student有查询，增加，修改和删除的功能。需要在MysqL的root用户下进行

-- 512.笔记 jb51.cc
  MysqL>grant select,delete on student.* to test2@192.168.2.12 identified by "123456";
  MysqL>flush privileges;

例3：授权用户test3拥有数据库student的所有权限

-- 512.笔记 jb51.cc
  MysqL>grant all privileges on student.* to test3@localhost identified by "123456";
  MysqL>flush privileges;

3.修改用户密码

-- 512.笔记 jb51.cc
  MysqL>update MysqL.user set password=password("123456") where User="test1" and Host="localhost";
  MysqL>flush privileges;

4.删除用户

-- 512.笔记 jb51.cc
  MysqL>delete from user where user="test2" and host="localhost";
  MysqL>flush privileges;

5.删除数据库和删除表

-- 512.笔记 jb51.cc
  MysqL>drop database 数据库名;
  MysqL>drop table 表名;

6.删除账户及权限

-- 512.笔记 jb51.cc
  drop user 用户名@"%"
  drop user 用户名@localhost
  flush privileges;