HOMEWORK #6 Consider the following flawed ER diagram representing clubs and their activities. ID name club Sponsor date time building room activity capacity description A club has a unique ID and a name. An activity has a date, a time, and a description, and is in a room. A room has a unique (building, room number) and a capacity. Each activity is sponsored by exactly one club. 1. Following the rules we studied, convert the ER diagram into a relational schema. 2. The resulting schema is not in BCNF. Identify a non-trivial functional dependency where the le hand side is not a superkey. 3. Decompose into schemas that are in BCNF. 4. Modify the ER diagram so that it corresponds to the normalized schema and briefly explain wh the problem was with the original design.

HOMEWORK #6 Consider the following flawed ER diagram representing clubs and their activities. ID name club Sponsor date time building room activity capacity description A club has a unique ID and a name. An activity has a date, a time, and a description, and is in a room. A room has a unique (building, room number) and a capacity. Each activity is sponsored by exactly one club. 1. Following the rules we studied, convert the ER diagram into a relational schema. 2. The resulting schema is not in BCNF. Identify a non-trivial functional dependency where the le hand side is not a superkey. 3. Decompose into schemas that are in BCNF. 4. Modify the ER diagram so that it corresponds to the normalized schema and briefly explain wh the problem was with the original design.

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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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

HOMEWORK #6
Consider the following flawed ER diagram representing clubs and their activities.
name
club
Sponsor
date
time
building
room
activity
capacity
description
A club has a unique ID and a name. An activity has a date, a time, and a description, and is in a
room. A room has a unique (building, room number) and a capacity. Each activity is sponsored by
exactly one club.
1. Following the rules we studied, convert the ER diagram into a relational schema.
2. The resulting schema is not in BCNF. Identify a non-trivial functional dependency where the left-
hand side is not a superkey.
3. Decompose into schemas that are in BCNF.
4. Modify the ER diagram so that it corresponds to the normalized schema and briefly explain what
the problem was with the original design.

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Step 1: 1) The relational schema that corresponds to the given ER diagram is:

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Step 2: 2) A non-trivial functional dependency where the left-hand side is not a superkey is:

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Step 3: To decompose the schema into BCNF, we can create two new tables:

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