Giving the following schema create an ER diagram for this Supermarket database, and show the primary keys, multivalued attributes, composite attributes, and relationship types. Supermarket has CUSTOMERS (CustomerID , First_Name, Last_Name) Supermarket has EMPLOYEES (EmployeeID, Name, Email, PhoneNo, Address, Salary) Each Employee purchase PRODUCTS (ProductID, Product_Type) Employee creates INVOICES( InvoiceID, Amount_Paid, Invoice_Date)

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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.