Designing an Inspiring Digital Camera Online Purchasing System

How can we create a comprehensive ER/EER schema diagram for a generic digital camera online purchasing system?

What are the main entities and relationships involved in the schema?

ER/EER Schema Diagram for Digital Camera Online Purchasing System

The ER/EER schema diagram for the generic digital camera online purchasing system includes entities such as Store, Camera, Lens, Customer, and Purchase Order. The relationships between these entities capture the various associations and constraints described in the system requirements, such as camera features, lens compatibility, and customer orders. The design choices are justified based on the given information and ensure the representation of all relevant data without introducing additional attributes or data requirements.

When developing a generic digital camera online purchasing system, it is essential to create a detailed ER/EER schema diagram to organize and represent the relevant data effectively. The main entities in the schema include Store, Camera, Lens, Customer, and Purchase Order.

The Store entity represents the camera stores selling the products and has a one-to-many relationship with the Camera entity. This relationship allows a store to sell multiple cameras from various manufacturers.

The Camera entity captures essential properties of digital cameras, such as manufacturer, model number, release date, sensor size, pixel number, retail price, and stock count. It also includes a multivalued attribute for camera features to accommodate different combinations of features like lens replacement, electronic viewfinder, and optical viewfinder.

The Lens entity represents the lenses compatible with the cameras, including properties like manufacturer, model number, focal length range, aperture range, retail price, and stock count. It has a relationship with the Camera entity to indicate that a camera can be associated with multiple lenses.

The Customer entity categorizes online customers as domestic or foreign and includes properties such as customer number, name, email address, and shipping address. Each customer can have any number of purchase orders.

The Purchase Order entity captures details of each customer's purchase, including the selling price and the specific product (camera or lens) ordered by the customer. It has one-to-many relationships with both the Camera and Lens entities to reflect customer orders accurately.

The design choices for the ER/EER schema diagram are made based on the given requirements to ensure all relevant data is represented without adding extra attributes or data requirements. The entities and relationships in the schema help organize and connect the different components of the generic digital camera online purchasing system effectively.

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