1
GATE CSE 2006
MCQ (Single Correct Answer)
+2
-0.6
The following functional dependencies are given :
$$\eqalign{ & AB \to CD,\,AF \to D,\,\,DE \to F, \cr & C \to G.\,\,\,\,\,\,\,\,\,\,F \to E.\,\,\,\,\,\,\,\,\,G \to A. \cr} $$

Which one of the following options is false?

A
$${\left\{ {CF} \right\}^ + }\,\,\, = \left\{ {ACDEFG} \right\}$$
B
$${\left\{ {BG} \right\}^ + }\,\, = \left\{ {ABCDG} \right\}$$
C
$${\left\{ {AF} \right\}^ + }\,\, = \left\{ {ACDEFG} \right\}$$
D
$${\left\{ {AB} \right\}^ + }\,\, = \left\{ {ABCDG} \right\}$$
2
GATE CSE 2005
MCQ (Single Correct Answer)
+2
-0.6
Consider a relation scheme $$R = \left( {A,\,B,\,C,\,D,\,E,\,H} \right)$$ on which the following functional dependencies hold: $$\left\{ {A \to B,\,\,BC \to D,\,\,E \to C,\,\,D \to A} \right\}.$$ What are the candidate keys of $$R?$$
A
$$AE, BE$$
B
$$AE, BE, DE$$
C
$$AEH, BEH, BCH$$
D
$$AEH, BEH, DEH$$
3
GATE CSE 2005
MCQ (Single Correct Answer)
+2
-0.6
In a schema with attributes $$A, B, C, D,$$ and $$E,$$ following set of functional dependencies are given
$$\eqalign{ & \,\,\,A \to B \cr & \,\,\,A \to C \cr & CD \to E \cr & \,\,\,B \to D \cr & \,\,\,E \to A \cr} $$

Which of the following functional dependencies is NOT implied by the above set?

A
$$CD \to AC$$
B
$$BD \to CD$$
C
$$BC \to CD$$
D
$$AC \to BC$$
4
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6
The relation scheme student Performance (Name, CourseNo, RollNo, Grade) has the following functional dependencies:

Name, courseNo $$\,\, \to \,\,$$ grade
RollNo, courseNo $$\,\, \to \,\,$$ grade
$$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,$$$$\,\,\,\,\,\,\,\,\,$$ Name $$\,\, \to \,\,$$ rollNo
$$\,\,\,\,\,\,\,\,\,\,\,\,\,$$$$\,\,\,\,\,\,\,\,\,$$ RollNo $$\,\, \to \,\,$$ name

The highest normal form of this relation scheme is

A
$$2\,NF$$
B
$$3\,NF$$
C
$$BCNF$$
D
$$4\,NF$$
GATE CSE Subjects
Software Engineering
Web Technologies
EXAM MAP