mysql change username code example

Example 1: change name of user mysql

RENAME USER old_user1 
TO new_user;

Example 2: change user mysql

[madegow@fedora20 ~]$ mysql -u root -p
Enter password: 
...
MariaDB [(none)]> select user()
-> ;
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)

MariaDB [(none)]> system mysql -u madegow -p
Enter password: 
...
MariaDB [(none)]> select user();
+-------------------+
| user()            |
+-------------------+
| madegow@localhost|

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Sql Example