I need help with Physical ER diagram with crows foot notation. Diagram needs entities/attributes/keys, relationship & cardinality identified between entities. Q - Newyork city library has reached out to your db team to help them set up their database. Need to keep track of below. record of each book – including a unique ID to identify each book, book title, author’s name. record of customers who have a library card – including customer’s name, address, their unique ID. record of which customer has checked out which books, duration of the checkout and whether the customer owes any fines.

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.