Entity-Relationship Diagram (ERD) An ERD visually represents the relationships between entities in a database. Here's what you need: Entities: Product: Represents items sold by the coffee shop. Transaction: Represents a sale event. Payment: Represents the payment method used for transactions. BeanCard: Represents the loyalty or prepaid cards customers can use. Attributes: Product: Product ID, Name, Category (Beverages, Bakery goods), Price. Transaction: Transaction ID, Date, Total Amount. Payment: Payment ID, Type (Cash, Credit, BeanCard), Amount. BeanCard: Card ID, Customer ID, Balance. Relationships: Products to Transactions: A transaction can include multiple products (many-to-many). Transactions to Payment: A transaction is completed with a single payment method (one-to-one). BeanCard to Payment: A BeanCard can be used for many payments (one-to-many). Data Flow Diagram (DFD) Level-0 A Level-0 DFD provides a broad overview of the system's major processes, data flows, and data stores. Here's what you need: Processes: Process Sale: Handles the selling of items to customers. Process Payment: Manages the payment for the transactions. Manage Inventory: Keeps track of the items in stock. Manage BeanCards: Manages the balance and transactions on BeanCards. External Entities: Customer: Interacts with the POS to purchase goods. Supplier: Provides the inventory to the coffee shop. Data Stores: Product Inventory: Stores details about the products. Sales Records: Stores completed transactions. BeanCard Records: Stores information and balances on BeanCards. Data Flows: Product Selection: Data about what the customer wants to buy. Payment Information: Data about the payment method and amount. Inventory Update: Data about inventory changes after a sale. BeanCard Update: Data about balance changes on a BeanCard.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Entity-Relationship Diagram (ERD)

An ERD visually represents the relationships between entities in a database. Here's what you need:

Entities:

Product: Represents items sold by the coffee shop.
Transaction: Represents a sale event.
Payment: Represents the payment method used for transactions.
BeanCard: Represents the loyalty or prepaid cards customers can use.

Attributes:

Product: Product ID, Name, Category (Beverages, Bakery goods), Price.
Transaction: Transaction ID, Date, Total Amount.
Payment: Payment ID, Type (Cash, Credit, BeanCard), Amount.
BeanCard: Card ID, Customer ID, Balance.

Relationships:

Products to Transactions: A transaction can include multiple products (many-to-many).
Transactions to Payment: A transaction is completed with a single payment method (one-to-one).
BeanCard to Payment: A BeanCard can be used for many payments (one-to-many).

Data Flow Diagram (DFD) Level-0

A Level-0 DFD provides a broad overview of the system's major processes, data flows, and data stores. Here's what you need:

Processes:

Process Sale: Handles the selling of items to customers.
Process Payment: Manages the payment for the transactions.
Manage Inventory: Keeps track of the items in stock.
Manage BeanCards: Manages the balance and transactions on BeanCards.

External Entities:

Customer: Interacts with the POS to purchase goods.
Supplier: Provides the inventory to the coffee shop.

Data Stores:

Product Inventory: Stores details about the products.
Sales Records: Stores completed transactions.
BeanCard Records: Stores information and balances on BeanCards.

Data Flows:

Product Selection: Data about what the customer wants to buy.
Payment Information: Data about the payment method and amount.
Inventory Update: Data about inventory changes after a sale.
BeanCard Update: Data about balance changes on a BeanCard.

1. You are being recruited as a Systems Analyst in the newly opened coffee shop
called Urban Bean. They want to build a new Point of Sale system where the
customers can purchase items from their shop and checkout.
The shop sells the following items:
1. Beverages
2. Bakery goods
3. Bean cards - customers can load their coffee cards with any amount and use
it for the purchase.
For the above system:
a. Draw an ERD by identifying the entities, attributes and their relationships.
b. Draw a Level-0 DFD (

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