开始表演：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
mysql> create database test;
Query OK, 1 row affected (0.01 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql> grant all privileges on test.* to 'root'@'%';
ERROR 1410 (42000): You are not allowed to create a user with GRANT
mysql> grant all privileges on test.* to 'root'@'%' identified by '1111';
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by '1111'' at line 1
----挣扎一下----
mysql> grant all privileges on test.* to 'root'@'%' identified by "1111" ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by "1111"' at line 1
----老思路，像5.7一样，我直接赋权创建一个新用户----
事实证明，我是徒劳的~~~
mysql> grant all privileges on test.* to 'test'@'%' identified by "1111";
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by "1111"' at line 1
好吧，我还是老老实实一步一步创建吧
mysql> create user 'test'@'%' identified by '1111';
Query OK, 0 rows affected (0.02 sec)
mysql> grant all privileges on test.* to 'test'@'%' with grant option;
Query OK, 0 rows affected (0.01 sec)
来，试一下。
纳尼？？不行……
提示加密方式的原因（8.0的加密方式变了），我们查一下
mysql> select host,user,plugin from user;
ERROR 1046 (3D000): No database selected
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,plugin from user;
+-----------+------------------+-----------------------+
| host | user | plugin |
+-----------+------------------+-----------------------+
| % | test | caching_sha2_password |
| localhost | mysql.infoschema | caching_sha2_password |
| localhost | mysql.session | caching_sha2_password |
| localhost | mysql.sys | caching_sha2_password |
| localhost | root | caching_sha2_password |
+-----------+------------------+-----------------------+
5 rows in set (0.00 sec)
果然变了。我们来改一下
mysql> alter user 'test'@'%' identified with mysql_native_password ;
Query OK, 0 rows affected (0.01 sec)
看起来不设定密码不行的
mysql> alter user 'test'@'%' identified with mysql_native_password by '1111';
Query OK, 0 rows affected (0.01 sec)
终于好了，是不是很爽？