# Entity-Relationship Diagram to Relations Conversion## OverviewThe diagram illustrates the conversion of an Entity-Relationship Diagram (ERD) to relational database tables, showcasing the functional dependencies of all entities involved in a rental business context. The entities include CUSTOMER, COPY, FILM, and ACTOR, with their respective attributes and relationships.## Entities and Attributes### CUSTOMER- **Keys and Attributes:** - `Customer_Name` (Primary Key) - `Name` (FirstN, M, LastN) - `DOB` - `[TotalAmount]` - `CustomerType`- **Relationships:** - Rents copies of films.### COPY- **Keys and Attributes:** - `Copy_No` (Partial Identifier) - `Current_Condition` - `[No_of_CheckOut]`- **Relationships:** - **Rents** relation with CUSTOMER. - **Carries** relation to FILM.### FILM- **Keys and Attributes:** - `FID` (Primary Key) - `Title` - `Rate` - `Category` - `{Directors}`- **Relationships:** - **Carried by** COPY. - **Performed by** ACTOR (through ROLE).### ACTOR- **Keys and Attributes:** - `SSN` (Primary Key) - `Name`- **Relationships:** - **Performs a role** in FILM.## Relationships and Dependencies- **Rents:** The CUSTOMER entity rents a COPY, with attributes like `Check_OutDate`, `Due_Date`, and `[Amount_Paid]`.- **Copy-Carry-Film Relationship:** A COPY is associated with a specific FILM identified by the `FID`.- **Performs Role:** An ACTOR performs a certain role in a FILM, but the role detail is highlighted as an intermediary representation without explicit attributes in the diagram. ## Functional DependenciesEach entity's attributes are functionally dependent on its primary key, ensuring data integrity and eliminating redundancy. For example:- In the FILM entity, all attributes (`Title`, `Rate`, `Category`) depend on `FID`.- In the ACTOR entity, attributes are dependent on the `SSN`.This structured diagram effectively represents how a database for a rental system can be designed, focusing on clear entity relationships and functional dependencies.

First, convert the given Entity-Relationship Diagram (ERD) to relations, then do each relation's…

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Convert ERD to relations and show functional dependency of all relations

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

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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

# Entity-Relationship Diagram to Relations Conversion

## Overview

The diagram illustrates the conversion of an Entity-Relationship Diagram (ERD) to relational database tables, showcasing the functional dependencies of all entities involved in a rental business context. The entities include CUSTOMER, COPY, FILM, and ACTOR, with their respective attributes and relationships.

## Entities and Attributes

### CUSTOMER
- **Keys and Attributes:**
- `Customer_Name` (Primary Key)
- `Name` (FirstN, M, LastN)
- `DOB`
- `[TotalAmount]`
- `CustomerType`
- **Relationships:**
- Rents copies of films.

### COPY
- **Keys and Attributes:**
- `Copy_No` (Partial Identifier)
- `Current_Condition`
- `[No_of_CheckOut]`
- **Relationships:**
- **Rents** relation with CUSTOMER.
- **Carries** relation to FILM.

### FILM
- **Keys and Attributes:**
- `FID` (Primary Key)
- `Title`
- `Rate`
- `Category`
- `{Directors}`
- **Relationships:**
- **Carried by** COPY.
- **Performed by** ACTOR (through ROLE).

### ACTOR
- **Keys and Attributes:**
- `SSN` (Primary Key)
- `Name`
- **Relationships:**
- **Performs a role** in FILM.

## Relationships and Dependencies

- **Rents:** The CUSTOMER entity rents a COPY, with attributes like `Check_OutDate`, `Due_Date`, and `[Amount_Paid]`.
- **Copy-Carry-Film Relationship:** A COPY is associated with a specific FILM identified by the `FID`.
- **Performs Role:** An ACTOR performs a certain role in a FILM, but the role detail is highlighted as an intermediary representation without explicit attributes in the diagram.

## Functional Dependencies

Each entity's attributes are functionally dependent on its primary key, ensuring data integrity and eliminating redundancy. For example:
- In the FILM entity, all attributes (`Title`, `Rate`, `Category`) depend on `FID`.
- In the ACTOR entity, attributes are dependent on the `SSN`.

This structured diagram effectively represents how a database for a rental system can be designed, focusing on clear entity relationships and functional dependencies.

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