Is there any free tool available for subjected work.

theres data modelling tools which may or may not have that capability
Fabforce's dbDesigner
MySQL's Workbench
Heidi's HeidiSQL
amongst others

but you don't need those, you can use tools like MySQL's Administrator

or you can use plain SQL in tools lke MySQL's Query Browser

or you can even use plain SQL in a command line context in the MySQL console

thanx, i will check them out.

Fabforce is no longer developed. I like SQL*Power's Power*Architect. It's open source and free. Not as sophisticated as commercial tools (especially when it comes to printing) but does a nice job.
The model is stored in XML format, so it's pretty easy to work around some problems using self-written XSLT

SQL Power - Power*Architect Data Modeling Tool