僅新建一個newuser使用者
方法一：

MariaDB [(none)]> create user [email protected] identified by '123456';
Query OK, 0 rows affected (0.22 sec)

MariaDB [(none)]> select user from mysql.user;
+---------+
| user    |
+---------+
| aa      |
| root    |
| root    |
|         |
| aa      |
| bb      |
| lcz     |
 

| my      |
| mytest  |
| newuser |
| nome    |
| root    |
|         |
| root    |
+---------+
14 rows in set (0.00 sec)

MariaDB [(none)]> 

方法二：

MariaDB [(none)]> insert into mysql.user(user,host,password) values('ggo','localhost',password('1234'));
Query OK, 1 row affected, 4 warnings (0.24
 
 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.25 sec)

效果

[[email protected] ~]# mysql -uggo -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 5.5.52-MariaDB MariaDB Server

Copyright (c) 2000
 
, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> 

新建一個my使用者並且授權全部操作許可權

MariaDB [(none)]> grant all privileges on *.* to [email protected] identified by '123456';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> select user from mysql.user;
+--------+
| user   |
+--------+
| aa     |
| root   |
| root   |
|        |
| aa     |
| bb     |
| lcz    |
| my     |
| mytest |
| nome   |
| root   |
|        |
| root   |
+--------+
13 rows in set (0.14 sec)

MariaDB [(none)]> 

檢視使用者許可權

MariaDB [(none)]> show grants for [email protected];
+--------------------------------------------------------------------------------------------------------------------+
| Grants for [email protected]                                                                                            |
+--------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'my'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+--------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> 

指定部分授權

 grant insert,update,delete,select on *.* to [email protected];