The tables are in your moodle database. Assuming you are using mysql, they are accessible either via phpmyadmin which you can either install on its own or simply place the mysql folder from CVS (moodle.cvs.sourceforge.net) into your server's admin folder. You will then have a link to Database in the administration block when you login as the Moodle admin which will allow you to play around with the actual SQL tables, an activity that is not recommended for the faint-of-heart. Let me know if you have questions on how to accomplish what you are trying to do. Peace.