COIT20247 Database Design and Development

Part A. Database implementation using MS Access

Introduction

The sample solution of assignment 1 will be released on the unit website approximately two (2) weeks after the assignment 1 due date. You must use that sample solution of assignment 1 only for the following tasks:

Assessment task

1 Normalization

a) Map the ERD, from the sample solution, into a set of relations in at least Third Normal Form (3NF). You must ensure that your relations meet 3NF. There is no need to show your working.

b) Select any two of your relations from the previous step, 1a), and perform the following for each of those two relations:

List all the functional dependencies exist in the relation.

Demonstrate that the relation meets Third Normal Form (3NF).

For your help, an example for a Student relation’s 3NF justification has been provided below:

STUDENT (StudentID, Name, Address, DateOfBirth)

i. The primary key is StudentID which identifies a student. There will be one student name per Student ID because only one name is recorded for each student. Even though a student may have multiple addresses (e.g. a home address and a work address), the case study states that there is a need to record the home address only and hence there will be only one address for each student. There will be only one date of birth for each student. Thus, there are no repeating groups. Hence, this relation is in 1NF.

ii. The primary key is StudentID. This is the only candidate key since Name is not guaranteed to be unique (two different students may have the same name). Address is also not guaranteed to be unique. This means that Student ID functionally determines every other attribute in the table. There is a single valued simple candidate key (StudentId) and therefore no partial dependencies are possible. Hence, the relation is in 2NF.

iii. Name cannot be used to functionally determine any other attribute in the table since two different students may have the same name; likewise for address and date of birth.
Therefore there are no transitive dependencies in the table. Therefore it meets the requirements of first, second and third normal form.

The marking process of the queries for information requests may also consider the effectiveness of your SQL statements that have been used in the queries. It is important that your SQL statement must reflect the correct business logic & SQL syntax. (Use enough sample data so that the output is produced by each and every query).

1. Which properties have never been rented out? List the details that include the property address, type, weekly rental as well as the name of the property owner.

2. How many properties have been managed by each manager? Show the manager’s name, the number of properties managed. Order the list so that the manager who has managed the most properties appears first.

3. List the details of repair jobs performed by handymen in the last 6 months. The details should include the job ID, job description, the completed date, charge and the handyman’s name.

4. Which properties have received more than one application in the last 6 months from customers? Show the property ID, address, the weekly rental and the number of applications.

5. Find out the details of the rental activities that have the highest weekly rentals. The details should include customer’s names, the address of the properties and the weekly rentals.