Introduction to Computing (CS101)
Assignment # 02
Fall 2022
Total marks = 10
Deadline Date
January 23, 2023
Please carefully read the following instructions before attempting the assignment.
RULES FOR MARKING
It should be clear that your assignment would not get any credit if:
 The assignment is submitted after the due date.
 The submitted assignment does not open or the file is corrupt.
 Strict action will be taken if the submitted solution is copied from any other student or
the internet.
You should consult the recommended books to clarify your concepts as handouts are not
sufficient.
You are supposed to submit your assignment in Doc or Docx format.
Any other formats like scan images, PDF, ZIP, RAR, PPT, BMP, etc. will not be accepted.
Objectives:
 To learn about relational databases.
 To learn the use of relational database operators.
 To learn the syntax of writing relational database queries.
NOTE
No assignment will be accepted after the due date via email in any case (whether it is the case
of load shedding or internet malfunctioning etc.). Hence refrain from uploading assignments in
the last hour of the deadline. It is recommended to upload the solution file at least two days
before its closing date.
If you people find any mistake or confusion in the assignment (Question statement), please
consult with your instructor before the deadline. After the deadline, no queries will be
entertained in this regard.
For any query, feel free to email at:
CS101@vu.edu.pk
Question
Marks (10)
A software developer has built a relational database model for the Learning Management System
of an online learning website. Various relations (tables) are defined to store data records related to
each entity in a separate relation. Three of the Relations (STUDENT, COURSE, and
ENROLLMENT) defined in that database model along with their attributes are given below:
STUDENT
StudentName
DegreeProgram
…
…
…
…
…
…
StudentID
…
…
…
CourseCode
…
…
…
CourseTitle
…
…
…
StudentID
…
…
…
COURSE
TeacherID
…
…
…
DegreeProgram
…
…
…
ENROLLMENT
CourseID
…
…
…
ResidentCity
…
…
…
CreditHours
…
…
…
Semester
…
…
…
The developer needs to extract the following information given in Table-1 from his defined
database model using the relational database queries that consist of SELECT, PROJECT and JOIN
operators.
Sr. No.
Table-1: Required Information
Information required to be Extracted
1
Extract all the students from the STUDENT table belonging to a specific city.
2
Extract all the students from the STUDENT table who are enrolled in “BSCS” degree
program.
3
Extract all the records in the columns “Student Name” and “Degree Program” of the
STUDENT table.
4
Extract all the records in the columns “Course Code”, “Course Title” and “Degree
Program” of the COURSE table.
5
Extract all the courses from the COURSE table having three or more credit hours.
6
Join STUDENT and COURSE tables using the Degree Program attribute.
Now, in the below given table (Table-2), some relational database operations (Queries) related to
the above database model are defined along with the name of resulting new relation. The name of
the resulting new relation is also used as reference to identify that query (i.e. each query is
referenced as A, B, C, D, E, F, G, H, I, J, K, and L).
Table-2: Relational Queries
Relational Query (Operation)
A <- SELECT from STUDENT where ResidentCity='Lahore'
Name of the
Resulting Relation
(also a Reference
Label)
A
B <- PROJECT from STUDENT where City='Lahore'
B
C <- PROJECT [CreditHourse>=3] from COURSE
C
D
<- JOIN
STUDENT
and
COURSE where
STUDENT.
D
E <- PROJECT CourseCode, CourseTitle, DegreeProgram from
E
DegreeProgram=COURSE.DegreeProgram
COURSE
F <- SELECT from STUDENT where DegreeProgram = 'BSCS'
F
G <- JOIN COURSE and STUDENT on Column.DegreeProgram
G
H <- PROJECT from COURSE Columns[CourseCode, CourseTitle,
H
CreditHours]
I <- PROJECT StudentName, DegreeProgram from STUDENT
I
J <- SELECT Columns[StudentName, DegreeProgram] from
J
STUDENT
K <- SELECT [DegreeProgram = 'BSCS'] from STUDENT
K
L <- SELECT from COURSE where CreditHours >=3
L
This table (Table-2) contains both syntactically correct and incorrect relational database queries
(referenced as A to N). Out of these twelve (12) queries, six (6) syntactically correct queries can
be used to extract the information required in the table-1.
You are required to identify the correct relational database query from Table-2: Relational
Queries for each of the “Required Information” entry in Table-1 and mention its reference label
in the 2nd column of the below given table against the Sr. no. of Required Information. For
example, the answer to “Sr. no. 1” entry of “Required Information” column is query “A”
which is solved in the below given table.
Now, you need to fill the remaining five (5) entries in the below given table with the Reference
label of correct relational database against each Sr. No. of the required information table.
(Provide your Answer only in the below given Table)
Sr. No. of Required Information given in
Table-1
1
Reference label of the Correct Relational
Query
{Out of A, B, C, D, E, F, G, H, I, J, K, L}
from Table-2
A
(solved)
2
F
3
J
4
E
5
L
6
G
Note: You don’t need to copy the assignment statement or write any queries in your solution file.
Just mention the “reference label” of the correct relational database query from table-2 against the
Sr. No. of “Required Information” in the above table.
Best of Luck