Functional Dependency Quiz 1

Relational Database Design - Functional Dependency Quiz

1. __________ refers to a attribute or group of attributes mentioned in the left hand side of the arrow in a FD.

Discriminator
Determinant
Multivalued attribute
All of the above

2. In a functional dependency X --> Y, if Y is functionally dependent on X, but not on X's proper subsets, then we would call the functional dependency as

Full Functional Dependency
Partial Functional Dependency
Multivalued Functional Dependency
None of the above

3. Which of the following is the result of bad database design?

Repetition of Information
Inability to represent some information
Inconsistent database state due to some transaction
All of the above

4. If X is {E, G, H, M} and Y is {G, M} then X --> Y is

Augmentation Rule
Reflexivity Rule
Union Rule
Pseudotransitivity Rule

5. If X --> YZ then X --> Y and X --> Z is

Composition Rule
Reflexivity Rule
Union Rule
Decomposition Rule

6. Consider F1 and F2 as two sets of functional dependencies. If every functional dependency in F2 can be inferred from the functional dependencies of F1 using inference rules, then F1 is _________ of F2

Cover Set
Closure Set
Minimal Set
None of the above

7. If X --> Y is a functional dependency and X and Y are sets of attributes, what is the relationship between X and Y?

One-to-Many
Many-to-One
One-to-One
Many-to-Many

8. For a functional dependency X --> Y, it is said to be _________ if Y is the subset or equal to X.

Total
Trivial
Non-trivial
Partial

9. To check whether X (a set of one or more attributes) is a candidate key of relation R, we need to find ______ of X.

Canonical Cover
Closure
Minimal Cover
None of the above

10. (a) If every functional dependency in F1 can be inferred from F2 on application of inference rules, and
      (b) removal of any one attribute from any functional dependency of F2 violates (a).   
Then F2 is called ______ for F1.

Minimal Cover
Canonical Cover
Both Minimal and Canonical Cover
None of the above

Score =

Correct answers: