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ER to relational schema

ER to relational schema

Database System Concepts
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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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.
Transcribed Image Text:**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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