Question 1
a)
Analyze the following relational schema and write the SQL code for the given questions.
STUDENT(SID, S_Name, Year)
LECTURER(L_Name, OfficeNumber)
COURSE(CourseID, CourseName, L_Name)
COURSEWORK(SID, CourseID, Marks)
i)
What is Hamid office number?
ii)
Assume that lecturer Hamid changes his name to Daud. Show the SQL statements
to make the appropriate changes.
iii)
What are the names of students who got 75 marks and above for any courses?
iv)
Find the names of all current students taking course IAS2143.
v)
Find the names of the lecturers who teach each course.
vi)
Remove data for student’s name Nabila where her student ID is 200.
(20 marks)
Answer:
i)
SELECT
FROM
WHERE
OfficeNumber
LECTURER
L_Name = ‘Hamid’
(3 marks)
ii)
UPDATE
SET
WHERE
LECTURER
L_Name = ‘Daud’
L_Name = ‘Hamid’
(3 marks)
iii)
SELECT
FROM
WHERE
AND
STUDENT.S_Name
STUDENT, COURSEWORK
STUDENT.SID = COURSEWORK.SID
COURSEWORK.Marks >= 75
(4 marks)
iv)
SELECT
FROM
STUDENT.S_Name
STUDENT, COURSEWORK
WHERE
AND
STUDENT. SID = COURSEWORK.SID
COURSEWORK.CourseID = ‘IAS2143’
(4 marks)
v)
SELECT
FROM
WHERE
AND
COURSE.Lecturer
COURSE, COURSEWORK, STUDENT
COURSE.CourseID = COURSEWORK.CourseID
COURSEWORK.SID = STUDENT.SID
(4 marks)
vi)
DELETE
WHERE
STUDENT
S_Name = ‘Nabila’ and SID = ‘200’
(2 marks)
Question 2
a)
The Gill Art Gallery wishes to maintain data on their customers, artists and paintings.
They may have several paintings by each artist in the gallery at one time. Paintings may
be bought and sold several times. In other words, the gallery may sell a painting, then buy
it back at a later date and sell it to another customer.
Gallery Customer History Form
Customer Name
Miss Fatimah Yusof
21 Jalan Meranti Satu
Taman Sri Muda
40400 Shah Alam
Selangor
Phone (013) 323 6000
Purchases Made
Artist
Title
Purchase Date
Sales Price
03 - Carol Channing
15 - Dennis Frings
03 - Carol Channing
15 - Dennis Frings
Laugh with Teeth
South toward Emerald Sea
At the Movies
South toward Emerald Sea
09/17/2000
05/11/2000
02/14/2002
07/15/2003
7000.00
1800.00
5550.00
2200.00
Based on the above relation structure, create a new relation structure using record layout in:
i)
Create un-normalize form of relational schema
ii)
First Normal Form (1NF)
iii)
Second Normal Form (2NF)
iv)
Third Normal Form (3NF)
(10 Marks)
Answer
i) Un-normalize form
customer [ custno, cust_name, cust_addr, cust_phone, ( artist_id, artist_name, art_title,
pur_date, price) ]
( 1 mark)
ii) First Normal Form (1NF)
customer [ custno, cust_name, cust_addr, cust_phone]
cust_art [ custno, art_code, pur_date, artist_id, artist_name, art_title, price ]
note: the key chosen for the repeating group is the piece of art itself (a code was
assigned), however because a piece of art may be bought by a customer more than once,
the purchase date was added as part of the key to make the rows unique.
(1m x 2 = 2 marks)
iii) Second Normal Form (2NF)
customer [ custno, cust_name, cust_addr, cust_phone]
cust_art [ custno, art_code, pur_date, price ]
art [ art_code, art_title, artist_id, artist_name ]
(1m x 3 = 3marks)
v)
Third Normal Form (3NF)
customer [ custno, cust_name, cust_street, cust_city, cust_prov, cust_pstlcd, cust_phone]
cust_art [ custno, art_code, pur_date, price ]
art [ art_code, art_title, artist_id(FK) ]
artist [ artist_id, artist_name ]
(1m x 4 = 4 marks)
b)
Draw an entity-relationship model for the following statement:
A university consists of several faculties. Within each faculty there are several
departments. Each department may run a number of programme. Every programme is
composed of several subjects. A lecturer may teach many subjects and each subject may
be taught by a number of lecturers. All subjects is enrolled by many student.
(10 marks)
Answer:
consists
UNIVERSITY
1
FACULTY
M
1
has
M
PROGRAMME
M
run
DEPARTMENT
1
1
compose
M
SUBJECT
M
teaches
LECTURER
N
M
enroll
N
STUDENT
(Each entity 1 mark x 7 = 7 marks, each r/ship ½ m x 6 = 3 marks; total 10 marks)