1、先来看一个PASSWORD()函数，MYSQL使用MD5加密
SELECT PASSWORD(‘root’);

2、使用mysql数据库，查看用户表
USE mysql;
SELECT * FROM USER;

3、修改密码
UPDATE USER SET PASSWORD = PASSWORD(‘123456‘) WHERE USER=‘root‘

4、重启mysql服务，新密码生效

命令格式如下
GRANT 权限 ON 数据库.表 TO ‘账户名‘@‘账户类型‘  IDENTIFIED BY ‘密码‘

权阴有‘SELECT’、‘INSERT’、‘UPDATE’、‘DROP’、‘CREATE’、或‘ALL’


GRANT SELECT ON table.employee TO ‘zhangsan‘ @ ‘localhost‘ IDENTIFIED BY ‘123456’