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Wendy Summers      
4 years ago
In your car example, what if you had two customers buying the same name and year of car? Does that then duplicate the info in the car table?
Richard Rost             
4 years ago
The example I gave is oversimplified for class, but yes, the year, make, and model would be the same, but the foreign key (CustomerID) would be different allowing you to know which customer purchased which car. In a real-world database you would also have something to uniquely identify the specific car, like a VIN or other serial number. Plus make would have it's own table (Ford, Chevy, Audi, etc.) and so would model (Taurus, Focus, F150, etc.) and those would just be IDs too. But again, I was keeping it simple for class to teach you relationships. Does this answer your question?
Wendy Summers      
4 years ago
Yes, thank you.

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