MySQL ERROR 1396 (HY000) error problem when creating and deleting users is solved

As an open source and widely used relational database management system, MySQL is often used to handle various data operations. In MySQL, user management is a very important aspect. Although it is very easy to create and delete users in MySQL, you sometimes encounter errors with ERROR 1396 (HY000). This error usually occurs when:

ERROR 1396 (HY000) error occurred when creating the user

When you try to create an existing user, you will receive an ERROR 1396 (HY000) error. This error will prompt you that the user already exists and cannot create a user with the same name again. For example, if you try to create a user named "test" and this user already exists, you will see the following error message:

mysql> CREATE USER 'test'@'localhost' IDENTIFIED BY 'password';
ERROR 1396 (HY000): Operation CREATE USER failed for 'test'@'localhost'

This error indicates that you are trying to create an existing user. To solve this problem, you can edit an existing user or try to create a user with another name.

ERROR 1396 (HY000) error occurred when deleting the user

When you try to delete a non-existent user, you will also receive an ERROR 1396 (HY000) error. This error will prompt you that the user does not exist. For example, if you try to delete a user named "test" and this user does not exist, you will see the following error message:

mysql> DROP USER 'test'@'localhost';
ERROR 1396 (HY000): Operation DROP USER failed for 'test'@'localhost'

This error indicates that you are trying to delete a user that does not exist. To solve this problem, you need to confirm the existence of the user and try to delete it again.

View existing users

In order to avoid the above error, you need to confirm that the user already exists or does not exist. You can view existing users through the following command:

mysql> SELECT User FROM ;
+-------+
| User  |
+-------+
| user1 |
| user2 |
| user3 |
+-------+
3 rows in set (0.01 sec)

This command lists all users that already exist in MySQL. Through this list, you can confirm whether the user already exists or needs to be created/deleted.

Create a user and authorize it

In addition to the above error prompts, MySQL also provides some convenient tools to create and authorize users. Here is an example showing how to create and authorize a new user.

mysql> CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';
mysql> GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost';
mysql> FLUSH PRIVILEGES;

This example creates a user named "newuser" and authorizes it to have all permissions on all databases and data tables. Note: In order for authorization to take effect, you need to runFLUSH PRIVILEGESOrder.

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