corecoders

Hello friendz, I have to design a database structure. In the database I need fields for category, subcategory and product, category is the parent for subcategory and the parent of product is subcategory. There will be about 60 categories and 100 subcategories for each category and around 120 products for each subcategory. Which is the perfect way to design this database ? Using separate tables for each of the field ( and connecting through Primary key and foreign key ) or a single table ( with a parent field for connecting the fields .parent of category field will be 0 and the parent of subcategory will be 1 and parent of product will be 2). I want to make this professionally, so please help. Actually the database has too many other tables with thousands of rows but these are the fields that are accessing frequently. Please provide a solution Thank you guys