VTC-ITRW311.1
Resources/Hulpmiddels:
Requirements for this paper/Benodighede vir hierdie vraestel:
Answer Scripts/
Antwoordskrifte:
Attendance Slips (Fill-in Paper)/
Presensiestrokies (Invulvraestel):
Scrap Paper/
Rofwerkpapier
Multi-choice cards (A5)/
Multikeusekaarte (A5)
X
Multi-choice cards (A4)/
Multikeusekaarte (A4)
Graph Paper/
GrafiekPapier
Calculators/
Sakrekenaars
Laptop (Power not provided)/
Skootrekenaar (Krag word nie voorsien nie)
Type of Assessment/
Tipe Assessering:
Exam Opportunity:1
Duration/
Tydsduur:
3 Hrs 00 Min
Paper Number/
Vraestel Nommer:
1
Maximum Marks/
Maksimum Punte:
100
Module Code/
Modulekode:
ITRW311
Module Description/
Module Beskrywing:
COMPUTER SCIENCE
Date/
Datum:
2019/05/28
Time/
Tyd:
14:00
Qualification/
Kwalifikasie:
BSc Information Technology
Examiner(s)/
Eksaminator(e):
Internal/Interne
Moderator(s):
External Moderator(s)/
Eksterne Moderator(s):
Mr T Mogale-VTC;
Dr. FL Lugayizi-MC;
Submission of answer scripts/Inhandiging van antwoordskrifte: ORDINARY
Section B (Relational Data Modelling) - [20 Marks]
Question 2
2.1 Using examples define and identify the three types of relationships that exist and are
useful in data Modelling?
[5 Marks]
2.2 Give and define the five types of keys used in a Relational Database Model?
[5 Marks]
Question 3
2.3 Identify and describe the components of the table shown in Figure below using correct
terminology. Use your knowledge of naming conventions to identify the table’s probable
foreign key(s).
FIGURE1: EMPLOYEE TABLE
[10 Marks]
ITRW 311:
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Section C (Advanced Entity Relationship Modelling) - [20 Marks]
Question 3
3.1 Using relevant examples and applications kindly define what is meant by Generalization
Hierarchies. Also give a scenario where Generalization Hierarchies play an important part.
[5 Marks]
3.2 Using crow foot notation draw and define relationships for the following entities:
A) Student – University. B) City – House. C) Professor – Department.
D) Customer – Invoice
E) Employee – Skill
[5 Marks]
Question 4
4.1 Using an illustration draw and give an example of a simple relational database. Define two
entities named CUSTOMER and VENDOR. The two entities have to be linked via
primary key and foreign key and this link must be visible in the illustration. The entity
CUSTOMER contains PROD_CODE, PROD_DESCRIPTION, PROD_PRICE,
PROD_ON_HAND, and VEND_CODE as attributes. While the entity VENDOR contains
VEND_CODE, VEND_CONTACT, VEND_AREACODE and VEND_PHONE as
attributes.
[5 Marks]
4.2 Using the specialization Hierarchy example depicted in Figure 2 in the next page identify
and explain the following concepts (Use drawings where necessary):
I) Supertype
ii) Subtype Discriminators
iii) All Subtypes
iV) Partial Contraints
V) Unique Attributes
[5 Marks]
ITRW 311:
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FIGURE 2: SPECIALIZATION HIERACHY
ITRW 311:
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Section D (Normalization and Database Tables) - [20 Marks]
Question 5
5.1 Using relevant examples and illustrations explain the process of Normalization and its
different forms.
[3 Marks]
5.2 When is a table in 3rd Normal Form also known as 3NF?
[2 Marks]
5.3 Using the given diagram below identify and explain the indicated dependencies?
[5 Marks]
Question 6
6.1 Using the diagram given below create a database whose tables are at least in 2NF, showing
the dependency diagrams for each table.
[5 Marks]
6.2 Using the same diagram given above create a database whose tables are in 3NF, showing the
dependency diagrams for each table.
[5 Marks]
ITRW 311:
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Section E (Structural Query Language Applications) - [20 Marks]
Question 7
Refer to Figure 1 below and answer the questions to follow:
7.1 Using the ERD model shown in Figure 1 write the appropriate SQL code to create the
table structures for the entities shown in Figure 1. The structures should contain the
attributes specified in the ERD. Use data types that are appropriate for the data that will
need to be stored in each attribute. Remember to enforce primary key and foreign key
constraints where relevant.
[10 Marks]
ITRW 311:
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Question 8
8.1 Table 1 provides a small portion of the data that will be kept in the database. The data needs
to be inserted into the database for testing purposes. Write the INSERT commands
necessary to insert the Last 5 rows from Table 1 into the MEMBERSHIP table that was
created in Question 7.1.
[10 Marks]
oooooOooooo
TOTAL/TOTAAL: 100
File reference: 8.1.7.2.2
ITRW 311:
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