`DROP``USER``username@localhost;` `SELECT``User``, Host` `FROM``user``;` 设置安全性 set global validate_password_policy=0; 远程访问 也就是最高权限 grant all privileges on *.* to root@'%' identified by "Aa123456"; 更新用户 https://www.cnblogs.com/SZxiaochun/p/6401424.html