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1、mysql 启动命令 ：
mysql -uroot -p
2、mysql版本 查看命令：
select version();
image.png
3、查看用户名对应的host 命令 ：
select user,host from user;
image.png
4、修改用户的密码：
alter user '用户名'@'hostname' identified by 'newpwd';
---‘用户名’是要修改的用户名，hostname是user对应的host，‘newpwd’是新密码
image.png
修改用户zp新密码为1234
5、这个时候权限报错
ERROR 1227 (42000): Access denied; you need (at least one of) the SYSTEM_USER
privilege(s) for this operation
image.png
原因：MySQL8.0.16版本中新增了一个system_user帐户类型，由于root用户没有SYSTEM_USER权限，把权限加入后即可解决。
grant system_user on . to 'root';
image.png
6、刷新权限
flush privileges;
