Normalized e-commerce relational database schema with Customer, Product, Order, and Payment entities connected through carefully designed foreign keys and cardinality constraints. Data flows from Customer through Cart and CartItem to Order and OrderItem, with Products linked via Category, Subcategory, and Brand hierarchies, while Payments and Reviews attach to Orders and Products respectively. This schema enforces referential integrity, eliminates data redundancy, and supports complex queries for inventory, order fulfillment, and customer analytics on OCI databases. Fork this diagram on Diagrams.so to customize table structures, add indexes, or adapt it for your e-commerce platform's specific requirements. Consider partitioning Orders and OrderItems by date and denormalizing frequently-joined views for reporting workloads.