The Don't Repeat Yourself principal should be observed in creating a site, formatting content, making it readable.
The classic need for keeping records in a database is the "one-to-many" structure. e.g. One record containing a Customer's Name, Address etc linked to Many records of different purchase items. (example protocols and addresses)
We are going to walk through this setup using Stacks, foundation 6, Feeds and SQLite.
Customer Name: Bill
Purchase: Photo Stack
Customer Name: Bill
Purchase: Feeds Stack
Customer Name: Bill
Purchase: Photos Stack
Purchase: Feeds Stack