Department of Advanced Science and Technology
University of Computer Studies (Thaton)
Semester (III) (B.C.Sc. / B.C.Tech.) Examination
Database Management System (CST-2124)
September, 2023
Answer all questions.
Time allowed:
3 hours
I.
II.
Choose the correct answer for each of the following statements.
1. (c)
11. (b)
2. (b)
12. (b)
3. (a)
13. (c)
4. (d)
14. (c)
5. (b)
15. (c)
6. (c)
16. (d)
7. (d)
17. (c)
8. (c)
18. (a)
9. (b)
19. (b)
10. (d)
20. (c)
𝟏
𝟏
1. fid, flight_date, time, src, destination (𝟐 mark) ( src = “Chennai” (𝟐 mark) ^ destination = “New Delhi”
𝟏
𝟏
(𝟐mark) (flight)) (𝟐 mark)
𝟏
𝟏
2. fid, flight_date, time, src, destination(𝟐 mark) ( flight_date = “01/11/2023” (𝟐 mark)
𝟏
“01/11/2023” (
𝟐
^ flight_date =
𝟏
mark) (flight)) (𝟐 mark)
𝟏
3. fid(𝟐 mark) (pid=123
^ destination = “Chennai”
𝟏
(𝟐 mark)
𝟏
^ flight_date < “06/10/2023”
𝟏
(𝟐 mark)
𝟏
(flight⋈fid=fid booking) (𝟐 mark) ⋈pid=pid passenger) (𝟐 mark)
𝟏
4. pname (passenger) ( mark) - (pname (passenger⋈pid=pid booking)) (𝟏 mark)
𝟐
𝟏
𝟏
𝟏
𝟐
𝟐
𝟐
5. agency_name( mark) (agency_city=pass_city ^ pid= 123 ( mark) (agency⋈aid=aid booking) (
𝟏
mark) ⋈pid=pid passenger) (𝟐 mark)
III.
𝟏
(a) create table customer ( 𝐦𝐚𝐫𝐤)
𝟐
𝟏
(cid varchar (5), cname varchar (30), address varchar (20), (𝟐 𝐦𝐚𝐫𝐤)
primary key (cid)); (1 mark)
𝟏
create table meter_box (𝟐 𝐦𝐚𝐫𝐤)
𝟏
(mbid varchar (5), type varchar (10), keeps_tip int, (𝟐 𝐦𝐚𝐫𝐤)
primary key (mbid)); (1 mark)
𝟏
create table unit_price (𝟐 𝐦𝐚𝐫𝐤)
𝟏
(upid varchar (5), mbid varchar (5), ranges varchar (25), price int, (𝟐 𝐦𝐚𝐫𝐤)
primary key (upid), (𝟏 𝐦𝐚𝐫𝐤)
𝟏
foreign key (mbid) references meter_box (mbid) (𝟐 𝐦𝐚𝐫𝐤)
𝟏
on delete cascade on update cascade); (𝟐 𝐦𝐚𝐫𝐤)
𝟏
create table receipt (𝟐 𝐦𝐚𝐫𝐤)
(rid varchar (5), cid varchar (5), upid varchar (5), useunit int, dueDate int,
𝟏
amount int, primary key (rid), (𝟐 𝐦𝐚𝐫𝐤)
𝟏
foreign key (cid) references customer (cid) (𝟐 𝐦𝐚𝐫𝐤)
𝟏
on delete cascade on update cascade, (𝟐 𝐦𝐚𝐫𝐤)
𝟏
foreign key (upid) references unit_price (upid) (𝟐 𝐦𝐚𝐫𝐤)
𝟏
on delete cascade on update cascade); (𝟐 𝐦𝐚𝐫𝐤)
III.
(b)
𝟏
1. select cname (𝟐 𝐦𝐚𝐫𝐤)
𝟏
from customer (𝟐 𝐦𝐚𝐫𝐤)
𝟏
where address = ‘SanChaung’; (𝟐 𝐦𝐚𝐫𝐤)
2. select type, count(ranges) (𝟏 𝐦𝐚𝐫𝐤)
from meter_box as M, unit_price as U (𝟏 𝐦𝐚𝐫𝐤)
𝟏
where M.mbid= U.mbid (𝟐 𝐦𝐚𝐫𝐤)
𝟏
group by M.type; (𝟐 𝐦𝐚𝐫𝐤)
𝟏
3. select customer.cname ; ( 𝐦𝐚𝐫𝐤)
𝟐
𝟏
from customer, receipt; (𝟐 𝐦𝐚𝐫𝐤)
𝟏
where receipt.cid=customer.cid; (𝟐 𝐦𝐚𝐫𝐤)
𝟏
and amount > 30000; (𝟐 𝐦𝐚𝐫𝐤)
𝟏
4. update unit_price (𝟐 𝐦𝐚𝐫𝐤)
𝟏
set price=100 (𝟐 𝐦𝐚𝐫𝐤)
𝟏
where ranges = ‘75-100’(𝟐 𝐦𝐚𝐫𝐤)
and mbid = (select mbid from meter_box where type= ‘business’); (𝟐 𝐦𝐚𝐫𝐤)
𝟏
5. update customer (𝟐 𝐦𝐚𝐫𝐤)
𝟏
set address =‘NorthDagon’(𝟐 𝐦𝐚𝐫𝐤)
𝟏
where address =‘SanChaung’; (𝟐 𝐦𝐚𝐫𝐤)
𝟏
6. delete(𝟐 𝐦𝐚𝐫𝐤)
𝟏
from receipt (𝟐 𝐦𝐚𝐫𝐤)
where dueDate < ‘2023-03-31’; (𝟏 𝐦𝐚𝐫𝐤)
𝟏
𝟏
7. select meter_box.type(𝟐 𝐦𝐚𝐫𝐤), unit_price.ranges (𝟐 𝐦𝐚𝐫𝐤)
from meter_box, unit_price, receipt(𝟏 𝐦𝐚𝐫𝐤)
𝟏
where receipt.upid=unit_price.upid( 𝐦𝐚𝐫𝐤)
𝟐
𝟏
and receipt.mbid=meter_box.mbid(𝟐 𝐦𝐚𝐫𝐤)
𝟏
and unit_price.price between 50 and 70; (𝟐 𝐦𝐚𝐫𝐤)
𝟏
8. create view Below30 as (𝟐 𝐦𝐚𝐫𝐤)
𝟏
(select customer.cname, customer.address(𝟐 𝐦𝐚𝐫𝐤)
𝟏
from customer, meter_box, unit_price, receipt(𝟐 𝐦𝐚𝐫𝐤)
𝟏
where customer.cid=receipt.cid(𝟐 𝐦𝐚𝐫𝐤)
𝟏
and meter_box.mbid=receipt.mbid(𝟐 𝐦𝐚𝐫𝐤)
𝟏
and unit_price.upid=receipt.upid(𝟐 𝐦𝐚𝐫𝐤)
𝟏
and useunit < 30(𝟐 𝐦𝐚𝐫𝐤)
𝟏
and type= ‘domestic’); (𝟐 𝐦𝐚𝐫𝐤)
9. create user Smith@localhost (𝟏 𝐦𝐚𝐫𝐤) identified by ‘Smith123’; (𝟏 𝐦𝐚𝐫𝐤)
10. grant select (1 𝐦𝐚𝐫𝐤)
𝟏
on Below30 (𝟐 𝐦𝐚𝐫𝐤)
𝟏
to Smith@localhost; (𝟐 𝐦𝐚𝐫𝐤)
IV. (a)
student
sid
s_name
program
coruse_offerings
time
sec_no
room
year
semester
enrols
grade
teaches
instructor
iid
i_name
dept
title
is offered
course
course_no
syllabus
title
credits
IV. (b)
(1 mark)
(1 mark)
(1 mark)
instructor
student
IID
Iname
SID
Sname
advise
𝟏
(𝟐 𝐦𝐚𝐫𝐤)
𝟏
(𝟐 mark)
(1 mark)
IV. (c)
(1 mark)
(1 mark)
country
capital
Country_ID
Country_name
𝟏
(𝟐 𝐦𝐚𝐫𝐤)
V.
Capital_ID
Capital_name
has
𝟏
(𝟐 mark)
(a) 1. This table is unnormalized table. (1 mark)
2. It is necessary to further normalize the generated tables from question (1) to1NF
(1 mark) because this table has multiple value. (1 mark)
EmployeeCode EmployeeName ProjectName
101
Jolly
Project101
(𝟏 mark)
101
Jolly
Project102
102
Rehan
Project103
102
Rehan
Project104
3. It is necessary to further normalize the generated tables from question () to 2NF
(1 mark)because this table has partial dependency. (1 mark)
Employee_Project table
Employee table
EmployeeCode ProjectCode
EmployeeCode EmployeeName
101
P1
(𝟏 mark)
101
P2
102
P3
102
P4
Project table
ProjectCode
P1
Project101
(𝟐 mark)
Project102
P3
Project103
P4
Project104
Jolly
102
Rehan
(𝟏 mark)
ProjectName
P2
101
V.
(b) 1. Closure {id, name}+
𝟏
1. result ={id, name}(𝟐mark)
𝟏
1st loop for 3 times, (𝟐marks)
1. id→name, gender
2. name→gender
3. age, DOB→gender
result = {id, name, gender}
no change
no change
𝟏
(𝟏 𝟐 mark)
𝟏
2nd loop for 3 times, (𝟐marks)
1. id→name, gender
2. name→gender
3. age, DOB→gender
no change
no change
no change
𝟏
(𝟏 𝟐 mark)
𝟏
So, {id, name}+ = {id, name, gender}(𝟐marks)
2. Show that the FD id, DOB→gender holds for
1. id→name, gender
2. id, DOB→name, gender, DOB (1 mark)
3. id, DOB→gender(1 mark)
(given) (1 mark)
(1, Augmentation) (1 mark)
(2, Decomposition) (1 mark)