how to model discount on items in a database?

Question

I am building an ecommerce site and would like to offer discounts on certain items for a limited time.

My Product table (MySQL) looks like this:

Product
    -         


        

Answer 1

I would use a decimal for the discount column.

price * discount = $amount off

price - $amount off = price in cart

For limited time you could put in a expiration date column, and only return rows that are not expired.