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Computers and Technology, 23.03.2020 20:00 fufnun9757
Suppose a book author can be identified by an AuthorID and each book can be identified by an ISBN. Besides the identifier, an author and a book each has many other attributes like name, address, email, phone, and price, title, publisher, publish year, edition, etc. In general publishing business, an author may write no book or many books but every book must have at least one author.
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