Exam (elaborations)
COMP 353_Midterm winter 2024 practice exam solution Concordia University
- Course
- COMP 353
- Institution
- Concordia University ( )
COMP 353_Midterm winter 2024 practice exam solution Concordia University
[Show more]
Content preview
COMP 353_Midterm winter 2024 practice exam solution Concordia University•
Question 1
Correct
Mark 2.00 out of 2.00
Flag question
Question text
Let R(A,B,C,D, E) be a relation with FDs F = {AB→CD, A→E, C→D, D→E}
The decomposition of R into R1(A, B, C), R2(B, C, D) and R3(C, D, E) is (2 Points)
Select one:
Lossy and Dependency Preserving.
Lossless and Not Dependency Preserving.
Lossless and Dependency Preserving.
Lossy and Not Dependency Preserving.
Question 2
Correct
Mark 2.00 out of 2.00
Flag question
, Question text
Suppose R is a one-to-one relationship from R1 = { a, b, c, d} to R2 = {e, f, g, h}.
Of the following sets, which one is NOT a valid instance of R? (2 Points)
Select one:
{}, the empty set.
{(c, g)}.
{(a, e),(b,f),(b,g)}.
{(a, h), (b, g), (c, f), (d, e)}.
All of the above.
None of the above.
Question 3
Correct
Mark 2.00 out of 2.00
Flag question
Question text
Let R(A,B,C,D,E) be a relation with FDs F = {ABC→D, BD→A, E→B} (2 Points)
Select one:
R has more than three candidate keys.
R has exactly three candidate keys.
R has exactly one candidate key.
R has exactly two candidate keys.
Question 4
Correct
Mark 2.00 out of 2.00
Flag question
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller smartzone. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$16.55. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67474 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now