Entities and Relationships:
Users:
- UserID (Primary Key)
- Username
- Password (hashed and salted)
- First Name
- Last Name
- Address
- Phone Number
Products:
- ProductID (Primary Key)
- Name
- Description
- Price
- CategoryID (Foreign Key)
- Stock Quantity
- Image URL
Categories:
- CategoryID (Primary Key)
- Name
Orders:
- OrderID (Primary Key)
- UserID (Foreign Key)
- Order Date
- Status (e.g., Pending, Shipped, Delivered)
OrderItems:
- OrderItemID (Primary Key)
- OrderID (Foreign Key)
- ProductID (Foreign Key)
- Quantity
- Subtotal (Price * Quantity)
Entity Attributes:
- Users have personal information like username, email, and address.
- Products have details such as name, description, price, category, stock quantity, and an image URL.
- Categories group products together.
- Orders track the order date and current status.
- OrderItems represent the individual items within each order, including the quantity and subtotal.
- Users can place multiple orders, but each order is associated with one user.
- Orders can contain multiple order items, each linked to a product.
- Each product belongs to a single category.
Additional Considerations:
Authentication and Authorization: Implement authentication and authorization mechanisms to secure user data and ensure that only authorized users can place orders and access their own information.
Payment Information: Depending on your requirements, you may need to store payment information, such as credit card details. This should be handled securely and may require compliance with payment industry standards (e.g., PCI DSS).
Reviews and Ratings: If you want to allow customers to leave reviews and ratings for products, you can create additional tables to store this data.
Shipping Information: If you want to include shipping and tracking information, you can expand the schema to accommodate this data.
Discounts and Coupons: If you plan to offer discounts or coupons, you'll need to create tables to manage these promotions and apply them to orders.
Inventory Management: Implement mechanisms to update the stock quantity of products as orders are placed and fulfilled to ensure accurate inventory management.
Reporting and Analytics: Consider whether you need to store historical data for reporting and analytics purposes.
Remember that the complexity of your database schema may vary depending on the size and specific requirements of your online merchandise store. It's essential to maintain data integrity, security, and scalability as your store grows. Additionally, you should follow best practices for database design and consider indexing and optimization for better performance.
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