Hi rahulsingh,I am not familiar with Yahoo Web Hosting, Is it a virtual server service or shared? What control panel do they use? Can you install anything you want?
If it is a Linux based server and you can install software, then WebMin would be good. It has a MySQL server module that you could use. For that matter you could install phpmyadmin.
If you can't install software then it is most likely using cPanel, DirectAdmin, Plesk (Linux & Windows), or Parrallels Virtuozzo Power Panel; any of these options provide a way to manage MySQL.
You will need to provide more information on what tools and capabilities you have in your hosting environment; otherwise it is less likely you will get help.Steve