The request
“Create a public library circulation ERD with Patron, Book, Author, BookAuthor, Loan, and Reservation tables, the shown keys and attributes, books linked to authors, and patrons borrowing and reserving books.”
Then tryAdd overdue fines.Add branch locations.
What is in this drawing
Read the decisions behind it.
01
Separated Loan and Reservation entities to track current and future borrows.
02
Used many-to-one relationships from Loan to Patron and Book.
03
Author linked via many-to-many through BookAuthor junction table.
Reusable for any lending-library system needing core patron, book, and loan tracking.
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