Composite Primary key vs additional “ID” column?

Question

If we had a table like this:

Books (pretend \"ISBN\" doesn\'t exist)

• Author
• Title
• Edition
• Year of publication
• Price

Answer 1

Another good reason for using the surrogate primary key scenario is if the uniqueness constraint should change in the future (say, ISBN needs to be added to make a book unique). Rekeying your data will be much easier.