Exam (elaborations)
DBMS – Questions & Proper Answers (Expert Verified)
- Course
- Institution
DBMS – Questions & Proper Answers (Expert Verified)
[Show more]
Content preview
DBMS – Questions & Proper Answers (Expert Verified)A relation is in second normal form (2NF) if and only if it is in 1NF and ________.
Right Ans - all non-key attributes are determined by the entire primary key
A combination of one or more columns used to identify particular rows in a
relation is a ________. Right Ans - key
The reason(s) for having relations is to ________. Right Ans - store functional
dependencies
A combination of two or more columns used to identify particular rows in a
relation is a ________. Right Ans - composite key
A relation is in third normal form (3NF) if and only if it is in 2NF and ________.
Right Ans - there are no non-key attributes determined by another non-key
attribute
If a relation is in BCNF, and each multivalued dependency has been moved to a
relation of its own, then the relation is in ________. Right Ans - Fourth
Normal Form
An attribute is also known as a ________. Right Ans - field
Which of the following is true about the functional dependency (A, B) → (C,
D)? Right Ans - A and B together determine D.
Given the functional dependency (A, B) → C, (A, B) is a(n) ________. Right Ans
- determinant
composite determinant
When designing a database, one of the candidate keys in a relation is selected
as the ________. Right Ans - primary key
A relation is in Boyce-Codd normal form (BCNF) if and only if it is in 3NF and
________. Right Ans - every determinant is a candidate key
A tuple is also known as a ________. Right Ans - row
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 LeCrae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76747 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now