DC2NET Links

I am still very new but learning fast with PHP/MYSQL right now I am looking for a way to increase values in a database automatiacally with time by a specific value, more like point earning and increment stuff. i have a table with the value for point a user have. and another table with points earned. i want the table for points earn to increase by a percentage of points the user already have. like a fixed percent rate every 24hrs in the database.
How is this possible. i need help.

Thanks