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Information System

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FACULTY OF MEDIA, INFORMATION & COMMUNICATION TECHNOLOGY
DIPLOMA IN INFORMATION TECHNOLOGY
DATABASE SYSTEMS 621
3 YEAR DIPLOMA
1ST SEMESTER ASSIGNMENT
Name & Surname: ____________________________________________

ICAS No: _________________

Qualification: ______________________ Semester: _____ Module Name: __________________________
Date Submitted: ___________
ASSESSMENT CRITERIA

MARK
ALLOCATION

QUESTION 1

20

QUESTION 2

20

QUESTION 3

15

QUESTION 4
REFERENCE
According to the Harvard Method
LAYOUT AND SPELLING
Font – Calibri 12
Line Spacing – 1.0
Margin should be justified.
TOTAL

25
10

10
100
Examiner’s Comments:

Moderator’s Comments:

Signature of Examiner:

Signature of Moderator:

Page 1 of 4

EXAMINER
MARKS

MODERATOR
MARKS

The purpose of an assignment is to ensure that the Learner is able to:


Use methods of enquiry and research in a disciplined field.



Interpret and evaluate text.



Have a sound understanding of key principles and theories, rules and awareness.



Solve unfamiliar problems using correct procedures as well as investigate and critically analyse information and report thereof.



Present and communicate information reliably and coherently.

Instructions and guidelines for writing assignments
1. Use the correct cover page provided by the institution.
2. All essay type assignments must include the following:
2.1 Table of contents
2.2 Introduction
2.3 Main body with subheadings
2.4 Conclusions and recommendations
2.5 Bibliography
3. The length of the entire assignment must have minimum of 5 pages. Preferably typed with font size 12
3.1 The quality of work submitted is more important than the number of assigned pages.
4. Copying is a serious offence which attracts a severe penalty and must be avoided at all costs. If any learner transgresses this rule, the lecturer will retain the assignments and ask the affected learners to resubmit a new assignment which will be capped at 50%.
5. Use the Harvard referencing method.

Page 2 of 4

QUESTION ONE

[20 MARKS]

1.1 Computer Sciences Department frequent fliers have been complaining to Dane County Airport officials about the poor organization at the airport. As a result, the officials decided that all information related to the airport should be organized using a DBMS, and you have been hired to design the database. Your first task is to organize the information about all the airplanes stationed and maintained at the airport. The relevant information is as follows:



Each airplane has a registration number, and each airplane is of a specific model.
The airport accommodates a number of airplane models, and each model is identified by a model number (e.g., DC-10) and has a capacity and a weight.
 A number of technicians work at the airport. You need to store the name, SSN, address, phone number, and salary of each technician.
 Each technician is an expert on one or more plane model(s), and his or her expertise may overlap with that of other technicians. This information about technicians must also be recorded.  Traffic controllers must have an annual medical examination. For each traffic controller, you must store the date of the most recent exam.
 All airport employees (including technicians) belong to a union. You must store the union membership number of each employee. You can assume that each employee is uniquely identified by a social security number.
 The airport has a number of tests that are used periodically to ensure that airplanes are still airworthy. Each test has a Federal Aviation Administration (FAA) test number, a name, and a maximum possible score.
 The FAA requires the airport to keep track of each time a given airplane is tested by a given technician using a given test. For each testing event, the information needed is the date, the number of hours the technician spent doing the test, and the score the airplane received on the test.
1.1.1

Draw an ER diagram for the airport database. Be sure to indicate the various attributes of each entity and relationship set; also specify the key and participation constraints for each relationship set. Specify any necessary overlap and covering constraints as well (in
English).

QUESTION TWO

[20 MARKS]

Given the dependency diagram shown in Figure 2-1 answer the following questions:

Figure 2-1: Dependency Diagram
2.1.

Identify and discuss each of the indicated dependencies.

Page 3 of 4

(8)

2.2.
2.3.

Create a database whose tables are at least in 2NF, showing the dependency diagrams for each table.
Create a database whose tables are at least in 3NF, showing the dependency diagrams for each table.

QUESTION THREE

(6)
(6)
[15 MARKS]

Modern businesses tend to provide continuous training to keep their employees productive in a fastchanging and competitive world. In addition, government regulations often require certain types of training and periodic retraining. (For example, pilots must take semiannual courses involving weather, air regulations, and so on.) To make sure that an organization can track all training received by each of its employees, trace the development of the ERD segment in Figure 3-1 from the initial business rule that states:
An employee can take many courses, and each course can be taken by many employees.
Once you have traced the development of the ERD segment, verify it and then provide sample data for each of the three tables to illustrate how the design would be implemented.

Figure 3.1: ERD Segment

(10)

QUESTION FOUR

[25 MARKS]

4.1

Using the INVOICE table shown below, write the relational schema, draw its dependency diagram, and identify all dependencies, including all partial and transitive dependencies.
Assume that the table does not contain repeating groups and that an invoice number references more than one product.
(5)
(Hint: This table uses a composite primary key)

Attribute Name

Sample Value

Sample Value

Sample
Sample Value
Sample Value
Value
INV_NUM
211347
211347
211347
211348
211349
PROD_NUM
AA-E3422QW
QD-300932X
RU-995748G AA-E3422QW
GH-778345P
SALE_DATE
15-JAN-2012
15-JAN-2012
15-JAN-2012 15-JAN-2012
16-JAN-2012
PROD-LABEL
Rotary sander 0.25-in drill bit
Band saw
Rotary sander
Power drill
VEND_CODE
211
211
309
211
157
VEND_NAME
NeverFail,Inc.
NeverFail,Inc.
BeGood, Inc
NeverFail,Inc.
ToughGo, Inc
QUANT_SOLD
1
8
1
2
1
PROD_PRICE
R49.95
R3.45
R39.99
R49.95
R87.75
4.1.1 Using the answer from 4.1, remove all partial dependencies, write the relational schema, and draw the new dependency diagram. Identify the normal forms for each table structure you created.
(10)
4.1.2 Using the answer from 4.2, remove all transitive dependencies, write the relational schema, and draw the new dependency diagram. Identify the normal forms for each table structure you created.
(10)
TOTAL MARKS 100

Page 4 of 4

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