ER to relational schema **Part 4: ER Diagram Translation to Relational Database Schema**The provided ER diagram illustrates entities and relationships for a vehicle management system. Below is a detailed description of its components:### Entities and Attributes:1. **Vehicle** - **Attributes**: VIN, Cost, Registration - **Relationships**: - Fitted with multiple Options - Has a Legal document (Tax Disc)2. **Option** - **Attributes**: ID, Expiry, Cost - **Relationships**: - Belongs to a Vehicle - Depends on multiple other Options3. **Tax Disc** - **Attributes**: Duration, Class - **Relationships**: - Connected to the Legal entity of a Vehicle4. **Depends** - A relationship entity indicating dependencies among options. - **Attributes**: Type, Notes - **Relationships**: - Connects multiple Options### Relationships:- **Fitted (1:N)**: A Vehicle can be fitted with many Options. Each Option belongs to exactly one Vehicle. - **Legal (1:1)**: A Tax Disc is legally required for each Vehicle. Each Vehicle has exactly one Tax Disc. - **Depends (M:N)**: Options can have dependencies, implying an Option can depend on multiple other Options and vice versa.### Explanation:The diagram uses ovals to denote attributes and rectangles for entities. Diamonds represent relationships. Relationships are further defined with specifics such as cardinality: - **1:N** indicates a one-to-many relationship.- **M:N** denotes a many-to-many relationship.This structure can be translated into a relational database schema by creating tables for each entity and relationships, using primary and foreign keys to maintain the connections between them.

In the above question, an Entity Relationship (ER) diagram is mentioned

Answered: ER to relational schema

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Computer Science

ER to relational schema

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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Question

ER to relational schema

**Part 4: ER Diagram Translation to Relational Database Schema**

The provided ER diagram illustrates entities and relationships for a vehicle management system. Below is a detailed description of its components:

### Entities and Attributes:

1. **Vehicle**
- **Attributes**: VIN, Cost, Registration
- **Relationships**:
- Fitted with multiple Options
- Has a Legal document (Tax Disc)

2. **Option**
- **Attributes**: ID, Expiry, Cost
- **Relationships**:
- Belongs to a Vehicle
- Depends on multiple other Options

3. **Tax Disc**
- **Attributes**: Duration, Class
- **Relationships**:
- Connected to the Legal entity of a Vehicle

4. **Depends**
- A relationship entity indicating dependencies among options.
- **Attributes**: Type, Notes
- **Relationships**:
- Connects multiple Options

### Relationships:

- **Fitted (1:N)**: A Vehicle can be fitted with many Options. Each Option belongs to exactly one Vehicle.

- **Legal (1:1)**: A Tax Disc is legally required for each Vehicle. Each Vehicle has exactly one Tax Disc.

- **Depends (M:N)**: Options can have dependencies, implying an Option can depend on multiple other Options and vice versa.

### Explanation:

The diagram uses ovals to denote attributes and rectangles for entities. Diamonds represent relationships. Relationships are further defined with specifics such as cardinality:

- **1:N** indicates a one-to-many relationship.
- **M:N** denotes a many-to-many relationship.

This structure can be translated into a relational database schema by creating tables for each entity and relationships, using primary and foreign keys to maintain the connections between them.

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