创建用户
mysql> select host,user,plugin,password_expired,password_last_changed,password_lifetime from user;
mysql> create user 'guest2'@'%' identified with caching_sha2_password by '123456';
mysql> select host,user,plugin,password_expired,password_last_changed,password_lifetime from user;
mysql> create user 'guest2'@'%' identified with caching_sha2_password by '123456';