Understanding the Business Domain: Mini POS Example
A Point of Sale (POS) system is designed to handle sales transactions, and in this case, we are considering a Mini POS system. Let's break down the key components and their relationships in the system.
1. Core Concept: Sales Transactions
The primary function of a POS system is to handle sales. When we talk about sales, we need to identify what is being sold—which, in this context, are products.
2. Product Table
To manage products, we need a Product Table. Each product can belong to different categories such as:
Fast Food (e.g., burgers, fries)
Beverages (e.g., water, soda)
Groceries (e.g., vegetables, snacks)
These categories help in organizing products effectively.
3. Managing Sales
We need to record every sale transaction. This involves creating a Sale Table to capture details of each sale. However, a sale can include multiple products, and each product sold in a transaction needs to be tracked individually.
4. Sale Detail Table
To handle multiple products in a single sale, we create a Sale Detail Table. This table links each sale to its respective products and records the quantity and price of each product sold.
Key Tables in the Mini POS System
Product Table: Stores product information.
Category Table: Stores different product categories.
Sale Table: Records each sale transaction.
Sale Detail Table: Records the details of products sold in each sale.
Process Flow
A Sale is initiated.
Products are selected from the Product Table.
Each product's details are recorded in the Sale Detail Table.
The overall sale transaction is recorded in the Sale Table.
This setup allows us to manage sales transactions efficiently and can be scaled from a mini POS system to an enterprise-level system.
Summary
When designing a system, start by identifying the main components (e.g., Sales, Products) and their relationships. Create tables to organize and store data effectively. This approach allows you to adjust the system's scope as needed.
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