Syntax
------

RENAME USER old_user TO new_user
  [, old_user TO new_user] ...

Description
-----------

The RENAME USER statement renames existing MariaDB accounts. To use it, you
must have the global CREATE USER privilege or the UPDATE privilege for the
mysql database. Each account is named using the same format as for the CREATE
USER statement; for example, 'jeffrey'@'localhost'. If you specify only the
user name part of the account name, a host name part of '%' is used.

If any of the old user accounts do not exist or any of the new user accounts
already exist, ERROR 1396 (HY000) results. If an error occurs, RENAME USER
will still rename the accounts that do not result in an error.

Examples
--------

CREATE USER 'donald', 'mickey';
RENAME USER 'donald' TO 'duck'@'localhost', 'mickey' TO 'mouse'@'localhost';

URL: https://mariadb.com/kb/en/rename-user/