1
GATE CSE 2003
MCQ (Single Correct Answer)
+2
-0.6
Consider the following functional dependencies in a database.
$$\eqalign{ & \,\,\,\,Date\,\,of\,\,Birth\,\, \to \,\,Age \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Age\,\, \to \,\,Eligibility \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Name\,\, \to \,\,Roll\_number \cr & \,\,\,\,\,Roll\_number\,\, \to \,\,Name \cr & Course\_number\, \to \,\,Course\_name \cr & Course\_number\, \to Instructor \cr & (Roll\_Number,\,Course\_number)\,\, \to \,\,Grade \cr} $$

The relation (Roll_number, Name, Date_of_Birth, Age) is

A
In $$2$$ $$NF$$ but not in $$3$$ $$NF$$
B
In $$3$$ $$NF$$ but not in $$BCNF$$
C
In $$BCNF$$
D
None of the above
2
GATE CSE 2002
MCQ (Single Correct Answer)
+2
-0.6
From the following instance of a relation schema $$R(A, B, C),$$ we can conclude that: GATE CSE 2002 Database Management System - Functional Dependencies and Normalization Question 23 English
A
A functionally determines $$B$$ and $$B$$ functionally determines $$C$$
B
A functionally determines $$B$$ and $$B$$ does not functionally determines $$C$$
C
$$B$$ does not functionally determines $$C$$
D
A does not functionally determine $$B$$ and $$B$$ does not functionally determine $$C$$
3
GATE CSE 2002
MCQ (Single Correct Answer)
+2
-0.6
Relation $$R$$ is decomposed using a set of functional dependencies, $$F,$$ and relation $$S$$ is decomposed using another set of functional dependencies, $$G.$$ One decomposition is definitely $$BCNF,$$ the other is definitely. $$3NF,$$ but it is not known which is which. To make a guaranteed identification, which one of the following tests should be used on the decompositions? (Assume that the closures of $$F$$ and $$G$$ are available).
A
Dependency-preservation
B
Lossless-join
C
$$BCNF$$ definition
D
$$3$$ $$NF$$ definition
4
GATE CSE 2001
MCQ (Single Correct Answer)
+2
-0.6
$$R(A,B,C,D)$$ is a relation. Which of the following does not have a lossless-join, dependency preserving $$BCNF$$ decomposition?
A
$$A \to B,\,B \to CD$$
B
$$A \to B,\,B \to C.\,C \to D$$
C
$$AB \to C,\,C \to AD$$
D
$$A \to BCD$$
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