Assignment on Database Systems

LSIS 5451 Final Assignment
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Database Systems LSIS 5451
Fall 2020
Final (Take Home) Examination
Due Date: Friday, November 20th, 2020, 11:59 pm
Instructions
You are not allowed to discuss this exam with anyone. By submitting your answers, you are
certifying that you did not give or receive any unpermitted aid in the exam. All answers
should be your own. Late submission will not be accepted.
Question 1 (20 points)
Consider a database that includes four relations Student, Staff, Program, Advisor
Student
BannerID FName LName PCode
8003778543 James Oloye P001
8765990453 Paul Carter P002
8002786543 Anita Boris P001
8307563321 Jane Eyre P001
Staff
BannerID FName LName PCode
8014768954 Chimamanda Adichie P002
8001876565 Paulette Davis P001
Program
PCode PName
P001 Library Science
P002 Management and Information Science
Advisor
staffBannerID studentBannerID
8001876565 8307563321
8014768954 8003778543
8001876565 8002786543
a. Write the SQL statement that will return the following result (10 points)
FName LName Program Students
Chimamanda Adichie Management and Information Science 1
Paulette Davis Library Science 2
b. For each query below, indicate if the query correctly returns the name of all
students who have not yet been assigned to an advisor. Anywhere between zero and
all queries compute the correct answer. Each query is syntactically correct. (10
points)
i. SELECT s.fname, s.lname
FROM student s LEFT OUTER JOIN advisor a ON s.BannerID =
a.studentBannerID
WHERE a. staffBannerID IS NULL;
ii. SELECT s.fname, s.lname
FROM student s
WHERE s.BannerID IN (SELECT a.studentBannerID FROM advisor a);
iii. SELECT s.fname, s.lname
FROM student s INNER JOIN advisor a ON s.BannerID = a.studentBannerID
GROUP BY s. BannerID, s.fname, s.lname
HAVING count(*) = 0;
Question 2 (30 points)
A company selling products both online and in their own stores have asked for your help in
creating a database.
a. Design an E-R model for the store that contains the following relations and their
attributes. (15 points)
• customer: cid, name
• sales: sid, date
• product: pid, name, price
Model the following relationships among the relations:
• Sales represents individual sales. Each sale has different products bought by a
customer.
• Each product in a sale could have a discount.
• inStoreSales consists of the sales in brick-and-mortar stores; storing the store name.
• onlineSales consists of online sales; storing the name of the browser and the
operating system used during the purchase.
• cid, sid, pid are int, price and discount are float, the rest are text.
• No attributes may be null, except for inStoreSales.store and onlineSales.os.
b. Write the CREATE TABLE statements to represent this E-R model using SQL
relations. Clearly label all the constraints. (5 points)
c. Write a SQL query that computes, for each customer, the total amounts that the
customer spent online and in store. Your query should include customers who did
not purchase anything. (10 points)
Question 3 (25 points)
Use the database of a Ski Resort, represented by the ER model above to answer the
following questions:
a. Explain the cardinality, participation and disjoint constraints that exists in the model (5
points)
b. Find all customers that rented a pair of skis that cost over $200 (5 points)
c. A skier should rent a pair of skis while a snowboarder should rent a snowboard. If a
person rents a different equipment from their expertise, a training should have been
completed. Write a query that finds all rentals in the past month with inconsistencies
between expertise and equipment (8 points)
d. The company is looking to purchase new equipment. Write a query that computes the
average price of a pair of skis and snowboards for each model. Display your results
sorted from the least price. (7 points)
Question 4 (25 points)
Consider a relational table:
Manager(manager_name, manager_id, manager_office_id, intern_id, intern_name,
intern_office_id, intern_designated_printer_id, printer_owner_id, printer_id, printer_model,
secretary_name, secretary_id, secretary_office_id )
Suppose the data has the following properties:
• Managers and secretaries have individual offices, interns share offices.
• Interns can work for multiple managers.
• Printers are owned by one manager.
• Managers can own multiple printers.
• Interns can only use one printer.
• The printer the interns uses must be owned by one of the managers they work for.
• Secretaries can work for multiple managers.
• Managers only have a single secretary.
a) Using the data above, provide examples of how insertion, deletion, and
modification anomalies could occur. (5 points)
b) Identify the functional dependencies among the columns in the table and state
any assumptions you make about the data. (10 points)
c) Using the functional dependencies identified in (b), describe and illustrate the
process of converting the table into 3NF tables. Identify the primary and foreign
keys in your tables. (10 points)
~ END OF EXAM ~
Thank you for making the class enjoyable and I hope you have learned a lot! Good luck with
finals and have an wonderful ~2 months of winter break!

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