INF2603/101/3/2019
Tutorial Letter 101/3/2019
Databases 1
INF2603
Semesters 1 & 2
School of Computing
IMPORTANT INFORMATION:
This tutorial letter contains important information
about your module.
CONTENTS
Page
1
INTRODUCTION .......................................................................................................................... 3
2
PURPOSE OF AND OUTCOMES FOR THE MODULE................................................................ 4
2.1
Purpose ........................................................................................................................................ 4
2.2
Outcomes ..................................................................................................................................... 4
3
LECTURER(S) AND CONTACT DETAILS................................................................................... 4
3.1
Lecturer(s) .................................................................................................................................... 4
3.2
Department ................................................................................................................................... 4
3.3
University ...................................................................................................................................... 4
4
RESOURCES ............................................................................................................................... 4
4.1
Prescribed book ............................................................................................................................ 4
4.1.1
Syllabus ........................................................................................................................................ 5
4.2
Recommended books ................................................................................................................... 5
4.3
Electronic reserves (e-reserves) ................................................................................................... 5
5
STUDENT SUPPORT SERVICES ................................................................................................ 5
5.1
E-tutors ......................................................................................................................................... 5
5.2
Free computer and internet access (telecentres) .......................................................................... 5
6
STUDY PLAN ............................................................................................................................... 6
7
PRACTICAL WORK AND WORK-INTEGRATED LEARNING ..................................................... 6
8
ASSESSMENT ............................................................................................................................. 6
8.1
Assessment plan .......................................................................................................................... 6
8.2
General assignment numbers ....................................................................................................... 7
8.3
Submission of assignments .......................................................................................................... 7
8.4
Semester 1: Assignments ............................................................................................................. 9
8.5
Semester 2: Assignments ........................................................................................................... 21
9
EXAMINATION ........................................................................................................................... 31
10
FREQUENTLY ASKED QUESTIONS ........................................................................................ 31
11
SOURCE CONSULTED ............................................................................................................. 31
2
INF2603/101
1 INTRODUCTION
Dear Student
Welcome to Databases I for semesters 1 and 2 in 2019. Please read this document in its
entirety as it contains very important information about the module. It contains all the
information about the module assignments. More details can be found online (myUnisa portal).
Databases I is a fully online module. This means all communication, tutorial matter and
submissions related to the module will be done through myUnisa (my.unisa.ac.za). There is no
study guide for this module and the prescribed book for the module is mentioned in section 4.1.
No tutorial matter (tutorial letters) will be sent to you through the post. All registered students
have access to this website. Please refer to the Study @ Unisa brochure (www.unisa.ac.za) on
how to access myUnisa and activate your myLife student account.
It is therefore compulsory that you visit myUnisa on a regular basis and check your Unisa
(myLife) e-mail regularly for the duration of your studies. We will be sending regular
announcements and it is your responsibility to read them and take appropriate action
afterwards.
Please refer to Tutorial Letter 301 for the contact details of the lecturers and the School of
Computing. Alternatively, send an e-mail to the module mailbox. The following are the
approximate dates for the beginning of both semesters in 2019:
Semester 1: 28 January 2019
Semester 2: 15 July 2019
Therefore, plan your registration accordingly and visit myUnisa to begin your studies and to
check all due dates for online assignments. Please note that no extensions will be granted for
late submission of any assignments in this module.
We are looking forward to seeing you online in 2019.
3
2 PURPOSE OF AND OUTCOMES FOR THE MODULE
2.1
Purpose
This module serves as a fundamental building block in equipping students with the knowledge
and competencies to understand and use databases. The module provides fundamental and
required knowledge, skills and values which will support further studies in the field of database
management design and implementation systems as required for studies in Information
Systems and Computer Science.
2.2
Outcomes

to demonstrate a well-rounded and systematic knowledge of the fundamentals of
database management systems

to be able to apply fundamental principles and techniques relevant to database
management

to design databases using the notations and strategies identified

to demonstrate a well-rounded and systematic knowledge of the fundamentals of the
Standard Query Language (SQL)
3 LECTURER(S) AND CONTACT DETAILS
3.1
Lecturer(s)
Please refer to Tutorial Letter 301 for contact details of the lecturers and the School.
3.2
Department
School of Computing
3.3
University
University of South Africa
4 RESOURCES
4.1
Prescribed book
Title
Authors
Publisher
Edition
Year of publication
ISBN
4
DATABASE SYSTEMS: Design, Implementation, and
Management
Carlos Coronel & Stephen Morris
Cengage Learning EMEA
13
2019
13: 978-1-337-62790-0 / 9781337627900 10:1-337-62790-9
INF2603/101
4.1.1 Syllabus
Chapter Topics in CMRC
Study instructions
1
Database Systems
Study in depth
2
Data Models
Study in depth
3
The Relational Database Model
Study in depth
4
Entity Relationship (ER) Modelling
Study in depth
5
Advanced Data Modelling
Study in depth
6
Normalisation of Database Tables
Study in depth
7
Introduction to Structured Query Language (SQL)
Study in depth
4.2
Recommended books
None
4.3
Electronic reserves (e-reserves)
There is a selection of YouTube videos for relational database concepts under Learning Units,
“Unit 0.3 YouTube Videos” and Discussion Forum “3. YouTube Videos”. We recommend you
watch the videos and discuss their content in the discussion forum.
5 STUDENT SUPPORT SERVICES
5.1
E-tutors
This module has e-tutors. Once you have been registered, you will be allocated to a group of
students with whom you will be interacting during the tuition period as well as an e-tutor who will
be your tutorial facilitator. Thereafter, you will receive an SMS informing you about your group,
the name of your e-tutor and instructions on how to log onto myUnisa in order to receive further
information on the e-tutoring process.
Additional important information appears in your Study @ Unisa brochure.
5.2
Free computer and internet access (Telecentres)
Unisa has entered into partnerships with establishments (referred to as telecentres) in various
locations across South Africa to afford you (as a Unisa student) free access to computers and
the internet. This access enables you to conduct the following academic activities: registration;
online submission of assignments; engaging in e-tutoring activities and signature courses; and
so on. Please note that any other activity except these is for your own account such as printing
and photocopying. For more information on the telecentre nearest to you, please visit
www.unisa.ac.za/telecentres.
5
6 STUDY PLAN
Use your Study @ Unisa brochure for general time management and planning skills.
A module-specific weekly schedule for the module is provided on myUnisa under Additional
Resources.
7
PRACTICAL WORK AND WORK-INTEGRATED LEARNING
None
8 ASSESSMENT
8.1
Assessment plan
8.1.1 Formative assessment (YM)
1. Assignment 01 (MCQ) – 20%
2. Assignment 02 (WRITTEN) – 35%
3. Introduce yourself and welcome at least TWO classmates – 5% (Assignment 03)
4. Discussion contribution on each of the posted topics – 5% (Assignment 04)
5. Seven (7) self-assessments – one for each chapter (MCQ)

Assignment numbers 05 – 11

7 x 5% each = 35%

All seven SAs have stipulated due dates (see below).
8.1.2 Summative assessment
1. Final examination: MCQ (20%) and WRITTEN (80%)
8.1.3 Assessment marks ratio
1. Year mark:
30%
2. Exam mark: 70%
ALL assignments MUST be submitted electronically through myUnisa!
8.1.4 Self-assessment
The module is comprised of SEVEN (7) self-assessments (SAs), one for each of the chapters in
the syllabus, as well as FOUR assignments. The self-assessments contribute 35% (5% each)
towards the year mark. ALL self-assessments of Semester 1 are available for submission from
11 February 2019. ALL self-assessments of Semester 2 are available for submission from 29
July 2019. NO EXTENSIONS will be granted of the due dates. If you do not submit the SA on
or before the due date, you will forfeit the marks. Each SA has an allocated time of TWO (2)
HOURS, after which automatic grading will be calculated when the time has elapsed. It is your
responsibility to find TWO hours to complete an assessment. Students have only TWO
ATTEMPTS to complete a self-assessment during the period it is open and the highest mark will
be recorded. Make sure that you attempt the SA after you have completed reading the particular
chapter.
6
INF2603/101
NO SPECIAL ARRANGEMENTS WILL BE MADE FOR MISSING A SUBMISSION DEADLINE
IN THE ALLOCATED TWO SUBMISSIONS.
8.2
General assignment numbers
Assignments are numbered consecutively per module, starting from 01.
IMPORTANT NOTE: Examination admission is determined by submission of Assignment 01,
which is compulsory. All ELEVEN (11) assignments contribute to the calculation of the year
mark; therefore, it is recommended that you submit all of them to improve your final year mark.
It is also good preparation for the final examination.
8.2.1
First Semester
Assignment Type
01
MCQ
02
Written
03
Discussions: Introduce Yourself
04
Discussions: Topics
05
SA – Ch1
06
SA – Ch2
07
SA – Ch3
08
SA – Ch4
09
SA – Ch5
10
SA – Ch6
11
SA – Ch7
TOTAL
Unique No
847979
777594
607336
653466
823031
620972
731840
671241
730896
653688
673534
Second Semester
Assignment Type
01
MCQ
02
Written
03
Discussions: Introduce Yourself
04
Discussions: Topics
05
SA – Ch1
06
SA – Ch2
07
SA – Ch3
08
SA – Ch4
09
SA – Ch5
10
SA – Ch6
11
SA – Ch7
TOTAL
Unique No
593516
842182
819294
885701
886737
642921
622240
667409
721441
649519
781147
8.3
8.3.1

Unique assignment numbers and due dates
Due Date 2019
15 Mar
11 Apr
8 Mar
5 Apr
01 Apr
01 Apr
15 Apr
15 Apr
22 Apr
22 Apr
22 Apr
Due Date 2019
03 Sep
20 Sep
29 Aug
13 Sep
09 Sep
09 Sep
17 Sep
17 Sep
27 Sep
27 Sep
27 Sep
Weight
20%
35%
5%
5%
5%
5%
5%
5%
5%
5%
5%
100%
Weight
20%
35%
5%
5%
5%
5%
5%
5%
5%
5%
5%
100%
Submission of assignments
Electronic submission of Assignment 01: Multiple-choice Assignment 01
Connect to the URL: https://my.unisa.ac.za
7

Register to become a user.

Once you are a registered user, click on the code for which you are registered, for
example, INF2603 – Assignment.

Select the multiple-choice assignment you wish to submit. Proceed to fill in the electronic
sheet. Submit the assignment after you have electronically made your selections.

Retain proof of submission.
8.3.2
Electronic submission of written Assignment 02

Connect to the URL: https://my.unisa.ac.za

Once you are a registered user, click on the code for which you are registered, for
example, INF2603 – Assignment.

Upload your Assignment 02 document ONLY in PDF format.
8.3.3
Electronic submission of discussions assignments (Assignments 03 and 04)

Connect to the URL: https://my.unisa.ac.za

Register to become a user.

Once you are a registered user, click on the code for which you are registered, for
example, INF2603.

Click on Discussions.

Click on Introduce Yourself for Assignment 03.

Click on Discussions Topics for Assignment 04.
8.3.4
Electronic submission of self-assessments (Assignments 05–11)

Connect to the URL: https://my.unisa.ac.za

Register to become a user.

Once you are a registered user, click on the code for which you are registered, for
example, INF2603.

Click on the Self-assessments link and a list of all active assignments will be displayed.

Click on the assignment you want to submit and answer the questions. Then submit for
grading.
DO NOT POST, FAX OR E-MAIL ASSIGNMENTS TO UNISA OR LECTURERS.
SUCH SUBMISSIONS WILL NOT BE MARKED!
8
INF2603/101
8.4
Semester 1: Assignments
SEMESTER 1
ASSIGNMENT 01
Due date
Tutorial matter covered in prescribed book
15 March 2019
Chapter 1: Database Systems
TOTAL MARKS: 100
Chapter 2: Data Models
Chapter 3: The Relational Database Model
Unique number: 847979
Select the most appropriate option:
For questions 1 to 4: Indicate whether the statement is true or false.
1 = True
2 = False
1.
Database programming languages receive all application requests and translate them
into the complex operations required to fulfil those requests.
2.
Even when a good database blueprint is available, an applications programmer’s view of
the data should match that of the manager and the end user.
3.
The practical significance of taking the logical view of a database is that it serves as a
reminder of the simple file concept of data storage.
4.
Depending on the sophistication of the application development software, nulls can
create problems when functions such as COUNT, AVERAGE, and SUM are used.
For questions 5-25: Identify the choice that best completes the statement or answers the
question.
5. An XML database supports the storage and management of _____ XML data.
1.
structured
2.
unstructured
3.
semistructured
4.
multistructured
9
6. Accurate, relevant, and timely information is the key to ____.
1.
data management
2.
good decision-making
3.
understanding
4.
knowledge
7. The database structure in a DBMS is stored as a _____.
8.
9.
10.
1.
single file
2.
collection of files
3.
collection of queries
4.
set of key/value pairs
The response of the DBMS to a query is the ___________.
1.
ad hoc query
2.
ad hoc response
3.
query result set
4.
integrated view of the data
A desktop database is a _____ database.
1.
single-user
2.
multi-user
3.
workgroup
4.
distributed
Which of the following refers to the situation where different versions of the same data
are stored at different places because they weren’t updated consistently?
11.
1.
Data query
2.
Data integrity
3.
Data dictionary
4.
Data redundancy
Which one of the following database management systems does not support analytical
data usage?
1. MS Access
2. Oracle RDBS
10
INF2603/101
3. SAP HANA
4. IBM DB2
12.
A(n) _____ is bidirectional.
1.
attribute
2.
entity
3.
relationship
4.
constraint
13.
14.
15.
16.
Students and classes have a _____ relationship.
1.
one-to-one
2.
one-to-many
3.
many-to-one
4.
many-to-many
A noun in a business rule translates to a(n) _____ in the data model.
1.
attribute
2.
entity
3.
relationship
4.
constraint
Oracle 12c, MS SQL Server, and Tamino are examples of _____ data models.
1.
hierarchical
2.
file system
3.
relational
4.
XML Hybrid
Which of the following is true of NoSQL databases?
1.
They do not support distributed database architectures.
2.
They are not based on the relational model.
3.
They are geared toward transaction consistency rather than performance.
4.
They do not support very large amounts of sparse data.
11
17.
18.
A(n) _____ enables a database administrator to describe schema components.
1.
extensible markup language (XML)
2.
unified modelling language (UML)
3.
data definition language (DDL)
4.
query language
Referential _____ dictates that the foreign key must either contain values that match the
primary key in the related table or must contain null.
19.
1.
integrity
2.
uniqueness
3.
model
4.
attribute
A _____ contains at least all of the attribute names and characteristics for each table in
the system.
20.
1.
data dictionary
2.
relational schema
3.
logical schema
4.
database
The _____ relationship is the “relational model ideal”.
1.
1:1
2.
1..M
3.
M:1
4.
M:N
21. In a database context, the word _____ indicates the use of the same attribute name to label
different attributes.
12
1.
redundancy
2.
homonym
3.
duplicate
4.
synonym
INF2603/101
22. A(n) _____ is an orderly arrangement used to logically access rows in a table.
1.
primary key
2.
relationship
3.
superkey
4.
index
23. According to Codd’s _____ rule of relational databases, application programs and ad hoc
facilities are logically unaffected when changes are made to the table structures that
preserve the original table values (changing the order of columns or inserting columns).
1.
distribution independence
2.
logical data independence
3.
comprehensive data sublanguage
4.
integrity independence
24. Which of the following refers to the activities that focus on the design of the database
structure that will be used to store and manage end-user data?
1.
data quality
2.
data warehouse
3.
data management
4.
data design
25. Which of the following returns all tuples in one relation that are not found in the other
relation?
1.
INTERSECT
2.
RESTRICT
3.
PROJECTION
4.
DIFFERENCE
13
Semester 1
Assignment 02
Due date
Tutorial matter covered in prescribed book
11 April 2019
All chapters in the syllabus
TOTAL MARKS: 100
Unique number: 777594
Question 1:
a.
[14]
What does it mean to say that a database displays both entity integrity and referential
integrity?
(2)
What is a strong (or identifying) relationship and how is it depicted in a Crow’s Foot
b.
ERD?
(2)
c.
What is an entity cluster and what advantages are derived from its use?
(3)
d.
What is a surrogate primary key and when would you use one?
(3)
e.
When implementing a 1:1 relationship, where should you place the foreign key if one side
is mandatory and one side is optional? Should the foreign key be mandatory or optional?
(4)
Question 2
[5]
Suppose you are working within the framework of the conceptual model shown in ERD diagram
below.
The ERD
14
INF2603/101
a.
Write the ten cardinalities that are appropriate for this ERD.
(5)
15
Question 3
[60]
3.1. The manager of a consulting firm has asked you to evaluate a database that contains the
table structure shown in the table below.
Table: Sample CLIENT Records
Attribute Name
Sample Value
Sample Value
Sample Value
CLIENT_NUM
298
289
289
CLIENT_NAME
Marianne R.
James D. Smith
James D. Smith
Brown
CLIENT_REGION
Midwest
Southeast
Southeast
CONTRACT_DATE
10-Feb-2018
15-Feb-2018
12-Mar-2018
CONTRACT_NUMBER
5841
5842
5843
CONTRACT_AMOUNT
R22,985,00.00
R1,670,300.00
R11,250,000.00
CONSULT_CLASS_1
Database
Internet Services
Database Design
Administration
CONSULT_CLASS_2
Web Applications
Database
Administration
CONSULT_CLASS_3
Network Installation
CONSULT_CLASS_4
CONSULTANT_NUM_1
29
34
CONSULTANT_NAME_1
Rachel G. Carson
Gerald K. Ricardo Angela M. Jamison
CONSULTANT_REGION_1
Midwest
Southeast
Southeast
CONSULTANT_NUM_2
56
38
34
CONSULTANT_NAME_2
Karl M. Spenser
Anne T. Zuma
Gerald K. Jele
CONSULTANT_REGION_2
Midwest
Southeast
Southeast
CONSULTANT_NUM_3
22
45
CONSULTANT_NAME_3
Julian H.
Geraldo J. Rivera
25
Donatello
CONSULTANT_REGION_3
Midwest
Southeast
CONSULTANT_NUM_4
18
CONSULTANT_NAME_4
Donald Tau
CONSULTANT_REGION_4
West
The table was created to enable the manager to match clients with consultants. The
objective is to match a client within a given region with a consultant in that region, and to
16
INF2603/101
make sure that the client’s need for specific consulting services is properly matched to the
consultant’s expertise. For example, if the client needs help with database design and is
located in the south-east, the objective is to make a match with a consultant who is located
in the south-east and whose expertise is in database design. (Although the consulting
company manager tries to match consultant and client locations to minimise travel expense,
it is not always possible to do so.) The following basic business rules are maintained:

Each client is located in one region

A region can contain many clients.

Each consultant can work on many contracts

Each contract might require the services of many consultants.

A client can sign more than one contract but each contract is signed by only one client.

Each contract might cover multiple consulting classifications. (For example, a contract
may list consulting services in database and networking.)

Each consultant is located in one region.

A region can contain many consultants.

Each consultant has one or more areas of expertise (class). For example, a consultant
might be classified as an expert in both database design and networking.

Each area of expertise (class) can have many consultants in it. For example, the
consulting company might employ many consultants who are networking experts.
a. Given that brief description of the requirements and the business rules, write the
relational schema and draw the dependency diagram for the preceding (and very poor) table
structure. Label all transitive and/or partial dependencies.
(15)
b. Break up the dependency diagram you drew in Problem 3a to produce dependency
diagrams that are in 3NF and write the relational schema. (Hint: You might have to create a
few new attributes. Also make sure that the new dependency diagrams contain attributes
that meet proper design criteria; that is, make sure that there are no multivalued attributes,
that the naming conventions are met, and so on.)
(15)
c. Using the results of Problem 3b, draw the Crow’s Foot ERD.
(30)
Question 4
[8]
17
a.
What is a CROSS JOIN? Give an example of its syntax.
(4)
b.
Explain why the two following commands produce different results.
(2)
SELECT DISTINCT COUNT (V_CODE) FROM PRODUCT;
SELECT COUNT (DISTINCT V_CODE) FROM PRODUCT;
c. What MS Access/SQL Server function should you use to calculate the number of days
between the current date and 25 January 1999?
(2)
Question 5
[13]
The CIS Department at the UNIVERSITY OF SOWETO maintains the Free Acess to Current
Technology (FACT) library of e-books. The two relational schemas below are part of a database
held in a relational DBMS for the library of e-books.
BOOK (Book_Num, Book_Title, Book_Year, Book_Cost, Book_Subject, Pat_ID)
PATRON (Pat_ID, Pat_FName, Pat_LName, Pat_Type)
Given the structure and contents of the database shown in tables above, use SQL commands
to answer questions 5a–e .
NOTE: All SQL syntax must be correct; you will be penalised for missing characters!
a.
Write the SQL query to display the book number, title and cost for all books that cost
R599.95 sorted by book number as in the table below.
BOOK_NUM
b.
BOOK_COST
5235
Beginners, Guide to JAVA
599.95
5236
Database in the Cloud
599.95
5241
ITIL for Dummies
599.95
5243
DATABASES in Theory
599.95
Write the SQL code to enter the FIRST TWO rows for the table below.
BOOK_NUM
18
BOOK_TITLE
(3)
BOOK_TITLE
BOOK_COST
5235
Beginners, Guide to JAVA
599.95
5236
Database in the Cloud
599.95
5241
ITIL for Dummies
599.95
5443
DATABASES in Theory
599.95
(2)
INF2603/101
c.
Write a query to display the highest book cost in the system as in the table below.
(2)
Most Expensive
1265.95
d.
Write a query to display the total value of all books in the library as in the table below.
(3)
Library Value
192655.95
e.
Write a query to display the book, title with year, and subject for each book. Sort the
results by the book number as in the table below.
(3)
BOOK_NUM
BOOK
5235
Beginners, Guide to JAVA (2014)
5236
Database in the Cloud (2016)
5237
Mastering Research Proposal (2017)
5238
J++ in Mobile Apps (2015)
Programming
5239
iOS Programming (2017)
Programming
5240
Advanced Project Management (2018)
5341
ITIL for Dummies (2018)
SEMESTER 1
BOOK_SUBJECT
ASSIGNMENT 03
Programming
Cloud
Research
Project Management
Models
TOTAL MARKS: 100
Due date
Introduce Yourself Assignment
08 March 2019
Instructions: You are required to first post an introduction of
yourself and then welcome at least TWO classmates from the forum
19
“1. Introduce Yourself” (Ice-Breaker Activity) (see unit 0.2
Getting Started under Learning Units). (Full instructions are given
under section 9.3.3 above.)
This assignment contributes 5% towards your year mark.
Unique number: 607336
SEMESTER 1
ASSIGNMENT 04
TOTAL MARKS: 100
Due date
Discussions Topics Assignment
05 April 2019
Instructions: This assignment involves your participation in online
discussions topics posted for specific module concepts. You are
required to respond to ALL topics posted in the forum “2.
Discussions Topics” under Discussions. (Full instructions are
given under section 9.3.3 above.)
This task contributes 5% towards your year mark.
Unique number: 653466
SEMESTER 1
ASSIGNMENTS 05 – 12
TOTAL MARKS EACH: 100
SEVEN (7) self-assessments for each chapter in the syllabus
Instructions: Log onto myUnisa and navigate to Self-assessments (SA). Consult
section 9.1.4 for information on when a self-assessment is open for submission. (Full
instructions on how to access Self-assessments are given under section 9.3.4 above.)
Assignment
05
06
07
08
09
10
11
20
Type
SA – Ch1
SA – Ch2
SA – Ch3
SA – Ch4
SA – Ch5
SA – Ch6
SA – Ch7
Year Mark Contribution
Unique No
823031
620972
731840
671241
730896
653688
673534
Due Date 2019
01 Apr
01 Apr
15 Apr
15 Apr
22 Apr
22 Apr
22 Apr
Weight
5%
5%
5%
5%
5%
5%
5%
35%
INF2603/101
8.5
Semester 2: Assignments
SEMESTER 2
ASSIGNMENT 01
TOTAL MARKS: 100
Due date
Tutorial matter covered in prescribed book
03 September 2019
Chapter 1: Database Systems
Chapter 2: Data Models
Chapter 3: The Relational Database Model
Unique number: 593516
For questions 1 to 4: Indicate whether the statement is true or false.
1 = True
2 = False
1.
The DBMS reveals much of the database’s internal complexity to the application
programs and users.
2.
A disadvantage of the relational database management system (RDBMS) is its inability to
hide the complexities of the relational model from the user.
3.
The idea of determination is unique to the database environment.
4.
The DIVIDE operation uses one single-column table (eg, column “a”) as the divisor and
one two-column table (eg, columns “a” and “b”) as the dividend.
21
For questions 5 to 25: Identify the choice that best completes the statement or answers the
question.
5. End user data is _____.
1.
knowledge about end users
2.
raw facts of interest to the end user
3.
information about a specific subject
4.
accurate, relevant and timely information
6. Which one of the following database management system products does not support
Enterprise database?
1.
Microsoft Access
2.
Oracle RDBS
3.
IBM DB2
4.
SAP HANA
7. A(n) _____ might be written by a programmer or it might be created through a DBMS utility
program.
8.
1.
query
2.
operating system
3.
database management system
4.
application
A(n) _____ database supports a relatively small number of users (usually fewer than 50)
or a specific department within an organisation.
9.
22
1.
desktop
2.
workgroup
3.
enterprise
4.
transactional
A data warehouse contains historical data obtained from the _____.
1.
operational databases
2.
desktop databases
3.
enterprise databases
4.
workgroup databases
INF2603/101
10.
11.
12.
13.
14.
The organisation of data within folders in a manual file system is determined by _______.
1.
its date of creation
2.
its expected use
3.
the data processing specialist
4.
the title of the documents in the folder
Which of the following is true of spreadsheet applications?
1.
They are a better alternative to databases.
2.
They do not allow manipulation of data once entered.
3.
They provide enhanced security and robust data sharing features.
4.
They enhance the user's ability to understand the data.
A(n) _____ represents a particular type of object in the real world.
1.
attribute
2.
entity
3.
relationship
4.
node
Which of the following is true of business rules?
1.
They can serve as a communication tool between the users and designers.
2.
They allow the designer to set company policies with regard to data.
3.
They provide a framework for the company’s self-actualisation.
4.
They allow the designer to develop business processes.
Within the relational model, tables are known as ____, columns of tables are referred to
as ____, and rows of tables are called ____.
1.
tuples, attributes, entities
2.
relations, attributes, tuples
3.
relations, tuples, attributes
4.
relation, attributes, tuples
23
15.
A verb associating two nouns in a business rule translates to a(n) _____ in the data
model.
16.
1.
entity
2.
attribute
3.
relationship
4.
constraint
Which one of the following types of HDFS nodes stores all the metadata about a file
system?
17.
18.
1.
client node
2.
data node
3.
map node
4.
name node
A(n) _____ enables a database administrator to describe schema components.
1.
extensible markup language (XML)
2.
data definition language (DDL)
3.
unified modelling language (UML)
4.
query language
MySQL is an example of the _____.
1.
hierarchical model
2.
file system data model
3.
relational data model
4.
XML data model
19. The CUSTOMER table’s primary key is CUST_CODE. The CUSTOMER primary key
column has no null entries, and all entries are unique. This is an example of _____ integrity.
24
1.
null
2.
entity
3.
relational
4.
referential
INF2603/101
20.
The _____ is actually a system-created database whose tables store the user/designercreated database characteristics and contents.
21.
1.
unique index
2.
database tuple
3.
system catalogue
4.
systematic database
The _____ relationship should be rare in any relational database design.
1.
1:1
2.
1..M
3.
M:1
4.
M..N
22. In a database context, a(n) _____ indicates the use of different names to describe the same
attribute.
1.
entity
2.
duplicate
3.
homonym
4.
synonym
23. When you define a table’s primary key, the DBMS automatically creates a(n) _____ index
on the primary key column(s) you declared.
1.
key
2.
composite
3.
unique
4.
primary
24. According to Codd's _____ rule of relational databases, if the system supports low-level
access to the data, users must not be allowed to bypass the integrity rules of the database.
1.
non-subversion
2.
information
3.
guaranteed access
4.
view updating
25
25. Which of the following returns all tuples in one relation that are not found in the other
relation?
1.
PRODUCT
2.
SELECT
3.
PROJECT
4.
DIFFERENCE
SEMESTER 2
ASSIGNMENT 02
TOTAL MARKS: 100
Due date
Tutorial matter covered in prescribed book
20 September 2019
All chapters in the syllabus
Unique number: 842182
Question 1
[18]
a.
What is a subtype discriminator? Given an example of its use.
(3)
b.
Under what circumstances are composite primary keys appropriate?
(4)
c.
What are time-variant data and how would you deal with such data from a database
design point of view?
(2)
d.
Why are entity integrity and referential integrity important in a database?
e.
What two conditions must be met before an entity can be classified as a weak entity?
Give an example of a weak entity.
f.
(3)
Explain briefly but precisely the difference between single-valued attributes and simple
attributes. Give an example of each.
26
(2)
(4)
INF2603/101
Question 2
[10]
Suppose you are working within the framework of the conceptual model shown in ERD diagram
below.
The ERD FIGURE
b.
Write the business rules reflected in this ERD.
Question 3
[46]
Suppose that you have been given the table structure and data shown in the table below, which
was imported from an Excel spreadsheet. The data reflect that a professor can have multiple
advisees, can serve on multiple committees, and can edit more than one journal.
Table: Sample PROFESSOR Records
Attribute Name
Sample Value Sample Value
Sample Value
EMP_NUM
PROF_RANK
EMP_NAME
DEPT_CODE
DEPT_NAME
123
Professor
Ghee
CIS
Computer Info.
Systems
KDD-567
1215,
2312,
3233,
2218, 2098
104
Asst. Professor
Rankin
CHEM
Chemistry
PROMO, TRAF
APPL, DEV
JMIS, QED,
JMGT
DEV
118
Assoc. Professor
Ortega
CIS
Computer Info.
Systems
KDD-562
2134,
2789,
3456,
2002,
2046,
2018,
2764
SPR, TRAF
PROF_OFFICE
ADVISEE
COMMITTEE_CODE
JOURNAL_CODE
BLF-119
3102, 2782, 3311,
2008, 2876, 2222,
3745, 1783,
2378
Sample Value
Assoc. Professor
Smith
ENG
English
PRT-345
2873,
2765,
2238,
2901, 2308
PROMO, SPR
DEV
JCIS, JMGT
Given the information in the table:
a. Draw the dependency diagram.
(6)
27
b. Identify the multivalued dependencies.
(3)
c.
(4)
Create the dependency diagrams to yield a set of table structures in 3NF.
d. Eliminate the multivalued dependencies by converting the affected table structures to 4NF.
(7)
e. Draw the Crow’s Foot ERD to reflect the dependency diagrams you drew in part C. (Note:
You might have to create additional attributes to define the proper PKs and FKs. Make sure that
all of your attributes conform to the naming conventions.)
(26)
Question 4
[7]
a.
What three join types are included in the OUTER JOIN classification?
(3)
b.
What is the difference between the COUNT aggregate function and the SUM aggregate
function?
c.
(2)
What Oracle function should you use to calculate the number of days between your
birthday and the current date?
(2)
Question 5
[19]
Consider the contents of the ASSIGNMENT table and use SQL commands to answer questions
5a–e .
ASSIGNMENT Table
ASSIGN_NUM
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
28
ASSIGN_DATE
22-May-18
22-May-18
22-May-18
22-May-18
22-May-18
22-May-18
22-May-18
22-May-18
23-May-18
23-May-18
23-May-18
23-May-18
23-May-18
23-May-18
23-May-18
23-May-18
23-May-18
PROJ_NUM
EMP_NUM
ASSIGN_JOB
18
22
18
18
25
22
25
18
15
15
25
18
25
22
15
22
18
103
117
117
103
108
104
113
103
115
117
105
108
115
104
103
105
117
503
509
509
503
501
501
508
503
501
509
502
501
501
501
503
502
509
ASSIGN_CHG_HR
ASSIGN_HOURS
ASSIGN_CHARGE
84.5
34.55
34.55
84.5
96.75
96.75
50.75
84.5
96.75
34.55
105
96.75
96.75
96.75
84.5
105
34.55
3.5
4.2
2
5.9
2.2
4.2
3.8
0.9
5.6
2.4
4.3
3.4
2
2.8
6.1
4.7
3.8
295.75
145.11
69.1
498.55
212.85
406.35
192.85
76.05
541.8
82.92
451.5
328.95
193.5
270.9
515.45
493.5
131.29
INF2603/101
1018
1019
1020
1021
1022
1023
1024
1025
23-May-18
24-May-18
24-May-18
24-May-18
24-May-18
24-May-18
24-May-18
24-May-18
25
25
15
22
22
22
15
18
117
104
101
108
115
105
103
117
509
501
502
501
501
502
503
509
34.55
110.5
125
110.5
110.5
125
84.5
34.55
2.2
4.9
3.1
2.7
4.9
3.5
3.3
4.2
76.01
541.45
387.5
298.35
541.45
437.5
278.85
145.11
NOTE: All SQL syntax must be correct; you will be penalised for missing characters!
a.
Write the SQL query to list the assignment number, project number, employee number
and assignment charge per hour for all the projects that were assigned after the 24 th of
March 2018. Sort the results by employee number.
b.
(3)
Write the SQL code that will list only the distinct project numbers in the ASSIGNMENT
table, sorted by project number.
c.
(4)
Write the SQL code to validate the ASSIGN_CHARGE values in the ASSIGNMENT
table. Your query should retrieve the assignment number, employee number, project
number, the stored assignment charge (ASSIGN_CHARGE), and the calculated assignment
charge (calculated by multiplying ASSIGN_CHG_HR by ASSIGN_HOURS). Sort the results
by the assignment number.
d.
(5)
Write the SQL query to display the book number, title and cost for all books that cost
R599,95 sorted by book number as in the table below.
e.
(2)
Write a query to produce the total number of hours and charges for each of the projects
represented in the ASSIGNMENT table, sorted by project number. The output is shown
below:
PROJ_NUM
(5)
SumOfASSIGN_HOURS
SumOfASSIGN_CHARGE
15
20.5
1806.52
18
23.7
1544.80
22
27.0
2593.16
25
19.4
1668.16
29
SEMESTER 2
ASSIGNMENT 03
TOTAL MARKS: 100
Due date
Introduce Yourself Assignment
29 Aug 2019
Instructions: You are required to first post an introduction of yourself
and then welcome at least TWO classmates from the forum “1.
Introduce Yourself” (Ice-Breaker Activity) (see unit 0.2 Getting
Started under Learning Units). (Full instructions are given under
section 9.3.3 above.)
This assignment contributes 5% towards your year mark.
Unique number: 819294
SEMESTER 2
ASSIGNMENT 04
TOTAL MARKS: 100
Due date
Discussions Topics Assignment
13 Sep 2019
Instructions: T01his assignment involves your participation in
online discussions 45topics posted for specific module concepts.
You are required to respond to ALL topics posted in the forum “2.
Discussions Topics” under Discussions. (Full instructions are
given under section 9.3.3 above.)
This task contributes 5% towards your year mark.
Unique number: 885701
SEMESTER 2
ASSIGNMENTS 05–11
TOTAL
MARKS
100
SEVEN (7) Self-assessments for each chapter in the syllabus
Instructions: Log onto to myUnisa and navigate to Self-assessments (SA). Refer to
section 9.1.4 for information on when a self-assessment is open for submission. (Full
instructions on how to access self-assessments are given under section 9.3.4 above.)
Assignment
05
06
07
08
09
30
Type
SA – Ch1
SA – Ch2
SA – Ch3
SA – Ch4
SA – Ch5
Unique No.
886737
642921
622240
667409
721441
Due Date 2019
09 Sep
09 Sep
17 Sep
17 Sep
27 Sep
Weight
5%
5%
5%
5%
5%
EACH:
INF2603/101
10
11
SA – Ch6
SA – Ch7
Year Mark Contribution
649519
781147
27 Sep
27 Sep
5%
5%
35%
9 EXAMINATION
Use your Study @ Unisa brochure for general examination guidelines and examination
preparation guidelines.
Module-specific examination guidelines will be posted through myUnisa.
10 FREQUENTLY ASKED QUESTIONS
The Study @ Unisa brochure contains an A–Z guide of the most relevant study information.
11 SOURCE CONSULTED
Coronel, C & Morris, S. 2019. Database systems: Design, implementation, and management.
13th edition. Cengage Learning EMEA, 13: 978-1-337-62790-0 / 9781337627900 10:1-33762790-9.
©
2018 Unisa
31