Entity or attribute?
A library system records, for each book, its title, its ISBN, and its publisher. Publishers have an address and a contact number of their own, and several books share a publisher.
Should publisher be an entity or an attribute?
A library system records, for each book, its title, its ISBN, and its publisher. Publishers have an address and a contact number of their own, and several books share a publisher.
Should publisher be an entity or an attribute?