DBMS case study topics
IT1
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ABHISHEK PUROHIT
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ADITI
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ADITI PRASAD
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ADITYA
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ADITYA KASHYAP
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AKSHITA GUPTA
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ANMOL TREHAN
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ANSH KUMAIN
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ANSH SACHDEVA
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ANSHAY SAGAR
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ANUSHKA SINGH
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ARIHANT JAIN
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ASHISH KUMAR RAI
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ASMITA DEY
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AYUSH DIXIT
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BHANU
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BHAVYA KALRA
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BHUMI BATRA
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CHIRANJEEV BATRA
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DANIAL ALI NAQVI
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DEEPAK KUMAR
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DEEPANSHU SHARMA
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DEVANSH VERMA
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DEVANSHI SINGH
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DHRUV KOTRA
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DHRUV MITTAL
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DHRUV PRAKASH
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GAURAV
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HARSH SHARMA
Q1
Q2
Q3
Q4
Q5
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HARSHIT KHATTER
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HIMANSHU SHARMA
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HITEN VATS
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HITESH GANDHI
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ISHIKA SUNIL
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ISHITA KAPOOR
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KAUSHIK KOUL
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KETAN SINGH
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KUNAL SINGLA
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KUSHAGRA RANGA
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KUSHAGRA VARSHNEY
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MANISH SHARMA
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MAYANK GAGNEJA
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MAYANK GOEL
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MUDIT JAIN
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OMVIR SINGH
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PAARTH BHASIN
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PALAK GUPTA
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PARAM S RATANPAL
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PARITOSH KUMAR JHA
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PAWAN KUMAR
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PRAKASH KUMAR
PODDAR
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RAJAT GUPTA
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RISHABH BHATNAGAR
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RISHAV SASMAL
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RITIK RAJ
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ROHIT KUMAR
Q6
Q7
Q8
Q9
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RONIT DADRA
06311503120
SAGAR ASWAR
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SAHIL KUMAR JHA
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SAKSHAM KAUSHIK
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SAKSHI SAXENA
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SALONI KANSAL
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SARTHAK MAHESHWARI
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SATVIK SEHGAL
Q10
Q11
Q 1. Consider a relation ‘Employee’ with following attributes: Employee (EmpNo#, EName,
DName, Salary, DOJ, Gender) Suppose you are asked to find the department name and
number of employees in a given department. Write a PL/SQL block to using cursors for
retrieving and displaying the desired information.
Q 2. Consider a relation ‘Employee’ with following attributes: Employee (EmpNo#, EName,
DName, Salary, DOJ, Work_Experience, Gender) Write a PL/SQL program to display the
names of all the employees and increment percentage of salary according to their working
experiences, such as employees having more than 10 years of experience should be given
15% increment, employees having experience between 5 to 10 years should be given 10%
increment and employees with less than 5 years of experience should be given 5%
increment.
Q 3. Consider following relations ‘Student’ with following attributes: Student (Roll_No#,
Name, Course, Gender, Contact_No) Student_backup (RollNo#, Name, Date_of_Operation)
Create a trigger which will work before deletion in Student table and create a duplicate copy
of the record in another table Student_backup, with date of operation.
Q 4. Write a trigger for table Student called ‘Ensure_Case’ that converts the SName and city
to uppercase before they are inserted or updated in the table. If the insert statement given
by a user is: insert into Student values (‘Sunita’,‘MCA’, 20, ‘noida’) the trigger should convert
the name and city in upper case as – SUNITA and NOIDA
Q 5. Consider a relation ‘Employee’ with following attributes: Employee (EmpNo#, EName,
DName, Salary, DOJ, City) Using explicit cursor, write a PL/SQL code that displays the name
and salary of each employee from the Employee table whose salary is less than that
specified by a passed-in parameter value
Q6. Consider the following two transactions:
T1: read A
read B
if A=0 then B=B+1
write B
T2: read B
read A
if B=0 then A=A+1
write A
Add lock and unlock statements into these transactions, T1 and T2 so that they observe 2PL
protocol. Can the execution of these transactions result in a deadlock?
Q7 Consider a relation R=(A,B,C,D,E,F,G,H,I,J) and the set of functional dependencies
F={AB→C, BD→EF, AD→GH, A→I, H→J}.
Compute the key for R.
And decompose R into highest normal form.
Q8. Assume you are to compose database requirements of a wholesale dealer for audio,
video consumer equipment from different manufacturers (brands).Customers are the
various retail outlets (retailers). Wholesaler extends credit to old customer and special
discounts are offered to new customers (retailers). You have to generate an E-R model for
the above DBMS application with the scope restricted to details (queries on) of customers
(retailers), products stocked and their price discounts and credits offered etc.
Q9. Bob and Martin opened a CD Company, Inc., a family-owned business that sells audio
CDs of classic and best-selling children's stories. The Company has a number of distributors
from whom they purchase the CDs for resale. For selling purposes, the CDs are classified by
appropriate age groups: 4–6; 7–10; and 11–14. Roughly 30% of total sales occur within their
single retail store; the remaining 70% are through mail order. Sales are particularly strong
during the summer vacation months and Christmas shopping season. CD, Inc. has hired you
to design a relational database to manage all their data. The ERD should reflect the
following: • The Company offers its customers a purchasing incentive: all CDs are always
discounted 40% from the retail price. • The Company likes to store the names of “potential”
customers, even if they’ve never done business with them. • 3 times each year, the
Company sends out 5–6 page brochures to advertise their top-selling and latest-release CDs,
including general descriptions of each CD.
Q10. The railway reservation system facilitates the passengers to enquire about the trains
available on the basis of source and destination, booking and cancellation of tickets, enquire
about the status of the booked ticket, etc. The aim of case study is to design and develop a
database maintaining the records of different trains, train status, and passengers. The record
of train includes its number, name, source, destination, and days on which it is available,
whereas record of train status includes dates for which tickets can be booked, total number
of seats available, and number of seats already booked. You have to prepare an ERD for
railway reservation system. Description: Passengers can book their tickets for the train in
which seats are available. For Page 2 of 3 this, passenger has to provide the desired train
number and the date for which ticket is to be booked. Before booking a ticket for a
passenger, the validity of train number and booking date is checked. Once the train number
and booking date are validated, it is checked whether the seat is available. If yes, the ticket is
booked with confirm status and corresponding ticket ID is generated which is stored along
with other details of the passenger. After all the available tickets are booked, certain
numbers of tickets are booked with waiting status. If waiting lot is also finished, then tickets
are not booked and a message of non‐availability of seats is displayed. The ticket once
booked can be cancelled at any time. For this, the passenger has to provide the ticket ID (the
unique key). The ticket ID is searched and the corresponding record is deleted. With this, the
first ticket with waiting status also gets confirmed. List of Assumption Since the reservation
system is very large in reality, it is not feasible to develop the case study to that extent and
prepare documentation at that level. Therefore, a small sample case study has been created
to demonstrate the working of the reservation system. To implement this sample case
study, some assumptions have been made, which are as follows: 1. The number of trains has
been restricted to 5. 2. The booking is open only for next seven days from the current date.
3. Only two categories of tickets can be booked, namely, AC and General. 4. Total number of
tickets that can be booked in each category (AC and General) is 10. 5. The total number of
tickets that can be given the status of waiting is 2. 6. The in‐between stoppage stations and
their bookings are not considered.
Q11. Consider the following three relations:
Student (Roll, Name, Course, DateOf Reg)
Book (Bcode, Bname, Publisher, Author, Price)
Issue (Roll,Bcode, DateOfIssue, DateOfRet)
Now write queries for the following in relational algebra as well as in SQL:
1. Find the names of books issued to ‘Manoj’.
2. Find the price of the books issued to roll no. 20
3. Find the names of students with their course who issued books on 23rd February 2016.
4. Display the names and publisher of books issued to MCA students.
5. Display the names of books issued to Sonali and Monika both.