正确的姿势是：

CREATE USER ‘root‘@‘%‘ IDENTIFIED BY ‘****密码****‘; 
GRANT ALL ON *.* TO ‘root‘@‘%‘; 
ALTER USER ‘root‘@‘%‘ IDENTIFIED WITH mysql_native_password BY ‘****密码****‘;

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select host, user, authentication_string, plugin from user;

Mysql 8.0 ERROR 1064 (42000)