从 sql 数据库中删除没有名字的用户

Question

正在执行以下命令

MariaDB [(none)]> select distinct user from mysql.user;

结果

+-------------+
| User        |
+-------------+
| app_user    |
|             |
| test_u      |
| mariadb.sys |
| root        |
+-------------+
5 rows in set (0.001 sec)

所以我可能创建了一个没有名字的用户，对吗？也许是因为过去使用了错误的语法。问题是如何drop用户？像下面这样的东西似乎不起作用：

MariaDB [(none)]> drop user ' ';
ERROR 1396 (HY000): Operation DROP USER failed for ' '@'%'

Answer 1

drop用于删除表https://dev.mysql.com/doc/refman/8.0/en/drop-table.html、DROP TABLE User

尝试DELETE FROM User WHERE User.user = ' '

Answer 2

经过反复试验，我偶然发现了 mysql.user does not exist。在执行 mysql_secure_installation 期间，终端状态

By default, a MariaDB installation has an anonymous user, allowing anyone to log into MariaDB without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment.

Remove anonymous users? [Y/n] Y 
... Success!

所以这个' '用户就是这里描述的匿名用户。运行select distinct user from mysql.user;删除匿名用户后

结果

+-------------+
| User        |
+-------------+
| app_user    |
| test_u      |
| mariadb.sys |
| root        |
+-------------+

所以这个“ ”用户可能已经在那里了。

从 sql 数据库中删除没有名字的用户

Drop user without a name from sql database

sql

mariadb