Bookstore System ER diagram models a relational database with five core entities: Book, Member, Order, Employee, and OrderDetail. Members place orders through employees, with each order containing multiple line items linked to books via ISBN and quantity details. This schema demonstrates normalized design patterns for retail inventory management, member loyalty tracking, and order fulfillment workflows. Fork and customize this diagram on Diagrams.so to adapt it for your bookstore, library, or retail platform. The design supports transactional integrity through foreign keys while enabling analytics on sales, member behavior, and inventory levels.