Build Mart entity relationship diagram models a complete e-commerce platform with 14 core entities spanning customers, products, orders, and payments. Entities like Customer, Product, Order, and Payment connect through relationships such as PlacesOrder, OrderContains, and HasPayment, capturing the full transactional flow. This normalized schema demonstrates best practices for scalability, data integrity, and multi-tenant support critical to high-volume retail systems. Fork this diagram on Diagrams.so to customize for your OCI database deployment, add indexes, or extend with inventory management entities. The design supports complex queries across customer reviews, cart management, and order fulfillment while maintaining referential integrity.