Shopping Cart Database Structure

Posted by Paul Atkins on Stack Overflow See other posts from Stack Overflow or by Paul Atkins
Published on 2010-12-30T06:50:43Z Indexed on 2010/12/30 6:54 UTC
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mysql

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shopping-cart

Hi,

I have been studying the database structure for shopping carts and notice that when storing order details the product information is repeated and stored again in the table. I was wondering what the reasoning behind this would be? Here is a small example of what i mean:

Product Table

product_id     name               desc         price
1            product 1    This is product 1    27.00

Order Table

order_id   customer id     order_total
1             3               34.99

Order Details Table

order_details_id    product_id       product name      price    qty
       1                1              product 1        27.00     1

So as you can see the product name and price are stored again in the order details table. Why is this? The only reason i can think of is because the product details may change after the order has been placed which may cause confusion. Is this correct?

Thanks

Paul

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