更改加密方式：ALTER USER'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;
更新用户密码：ALTER USER'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
刷新权限：FLUSH PRIVILEGES;
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基本操作命令：
show databases;
create database 库名;
use mysql； //打开库
mysqladmin -u用户名 -p旧密码 password 新密码
drop database 删库名;
drop table 删表名;
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