Rename Root @ localhost username in MySQL?

The syntax is as follows to rename Root @localhost

UPDATE MySQL.user SET user = ‘yourNewRootName’ WHERE user = 'root';

To understand the above concept, let us check all the user names and host. The query is as follows

mysql> select user,host from MySQL.user;

The following is the output

+------------------+-----------+
| user             | host      |
+------------------+-----------+
| Bob              | %         |
| Manish           | %         |
| User2            | %         | 
| mysql.infoschema | %         |
| mysql.session    | %         |
| mysql.sys        | %         |
| root             | %         |
| @UserName@       | localhost |
| Adam Smith       | localhost |
| John             | localhost |
| John Doe         | localhost |
| User1            | localhost |
| am               | localhost |
| hbstudent        | localhost |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
+------------------+-----------+
16 rows in set (0.00 sec)

The following is the query to rename the user ‘root’ to some other name

mysql> UPDATE mysql.user set user = 'MyRoot' where user = 'root';
Query OK, 1 row affected (0.13 sec)
Rows matched: 1 Changed: 1 Warnings: 0

Let us check the user ‘root’ has been updated with new name ‘MyRoot’ or not. The query is as follows

mysql> select user,host from MySQL.user;

The following is the output

+------------------+-----------+
| user             | host      |
+------------------+-----------+
| Bob              | %         |
| Manish           | %         |
| MyRoot           | %         |   
| User2            | %         |
| mysql.infoschema | %         |
| mysql.session    | %         |
| mysql.sys        | %         |
| @UserName@       | localhost |
| Adam Smith       | localhost |
| John             | localhost |
| John Doe         | localhost |
| User1            | localhost |
| am               | localhost |
| hbstudent        | localhost |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
+------------------+-----------+
16 rows in set (0.00 sec)

Look at the sample output, the root has been updated with new name “MyRoot” successfully.