List the entities, their attributes and relationships for the description and make an ER-diagram for this e-Commerce Portal. You may use the concept of keys, aggregation, generalisation, cardinality etc. in a proper way. Design the suitable RDBMS tables for the ER-diagram created by you. The database design should include keys, foreign keys, constraints and referential integrity constraints. Your database design must be normalized up to 3rd Normal form. Make necessary assumptions wherever require.

E-Commerce Portal Description:

An e-commerce portal is an online platform that facilitates the buying and selling of products and services. It allows customers to browse through various product categories, view product details, add items to their cart, and complete the purchase process. The portal also enables sellers to list their products, manage inventory, and handle orders and shipments.

Entities, Attributes, and Relationships:

1. Customer: Attributes: CustomerID, FirstName, LastName, Email, Password, Address, City, State, ZipCode, Phone Relationships: Customers can place multiple Orders, and an Order is placed by one Customer.
2. Product: Attributes: ProductID, ProductName, Description, Price, Quantity, CategoryID Relationships: A Product belongs to one Category, and a Category can have multiple Products.
3. Category: Attributes: CategoryID, CategoryName, Description Relationship: A Category can have multiple Products.
4. Order: Attributes: OrderID, OrderDate, ShippingAddress, ShippingCity, ShippingState, ShippingZipCode, TotalAmount, CustomerID Relationships: An Order is placed by one Customer, and an Order can have multiple OrderItems.
5. OrderItem: Attributes: OrderItemID, OrderID, ProductID, Quantity, Price Relationships: An OrderItem belongs to one Order, and an OrderItem is associated with one Product.
6. Seller: Attributes: SellerID, SellerName, Email, Password, Address, City, State, ZipCode, Phone Relationships: A Seller can list multiple Products, and a Product is listed by one Seller.

ER-Diagram:

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