Online toy store entity-relationship diagram modeling five core tables: Users, Categories, Products, Orders, and OrderItems with proper primary and foreign key relationships. Users table captures authentication and profile data including user_id, username, email, password_hash, full_name, address, and created_at timestamp. Products link to Categories via foreign key and include inventory management fields like stock_qty, price, and image_url. Orders connect Users to OrderItems through foreign keys, enabling order tracking with status and total_amount fields. OrderItems junction table resolves the many-to-many relationship between Orders and Products, storing quantity and unit_price for historical accuracy. This normalized schema eliminates data redundancy and enforces referential integrity across the entire toy retail platform. Fork this diagram on Diagrams.so to customize table structures, add indexes, or extend with reviews and wishlists. The design follows BCNF principles suitable for transactional OLTP workloads.