Basic Retail Database ER Diagram

This ERD template models a simple customer purchase workflow using three main entities: Customer, Product, and Purchase. The Customer entity includes CustomerID as the primary key, uniquely identifying each customer. The Product entity features ProductID as its primary key and includes CustomerID as a foreign key, indicating which customer owns or is associated with each product. The Purchase entity has PurchaseID as its primary key and uses ProductID as a foreign key to link each purchase to a specific product. This ERD clearly demonstrates how primary and foreign keys define relationships across entities in a retail or inventory-based database system.

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