Question
Consider the following business case: The library provides books to borrowers. Each book is described by title, edition and year of publication and is uniquely
Consider the following business case:
The library provides books to borrowers. Each book is described by title, edition and year of publication and is uniquely identified using the ISBN. Each borrower is described by his or her name and address and is uniquely identified using a borrower number. The library provides one or more copies of each book and each copy is uniquely identified using a copy number, status indicating if the book is available for loan and the allowable loan period for a given copy. A borrower may loan one or many books and the date each book is loaned out and is returned is recorded. Loan number uniquely identifies each book loan.
Based on this description, the following ER model has been built.
Answer the following questions :
- Identify a misrepresentation of facts in this ER model.
- Re-draw the ER diagram to address this shortcoming.
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