1
GATE CSE 2022
MCQ (Single Correct Answer)
+1
-0.33

In a relational data model, which one of the following statements is TRUE?

A
A relation with only two attributes is always in BCNF.
B
If all attributes of a relation are prime attributes, then the relation is in BCNF.
C
Every relation has at least one non-prime attribute.
D
BCNF decompositions preserve functional dependencies.
2
GATE CSE 2022
Numerical
+1
-0.33

Consider a relation R(A, B, C, D, E) with the following three functional dependencies.

AB $$\to$$ C ; BC $$\to$$ D ; C $$\to$$ E;

The number of superkeys in the relation R is _________.

Your input ____
3
GATE CSE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
A database of research articles in a journal uses the following schema.
(VOLUME, NUMBER, STARTPAGE, ENDPAGE, TITLE, YEAR, PRICE)
The primary key is (VOLUME, NUMBER, STARTPAGE, ENDPAGE) and the following functional dependencies exist in the schema.
(VOLUME, NUMBER, STARTPAGE, ENDPAGE) → TITLE
(VOLUME, NUMBER) → YEAR
(VOLUME, NUMBER, STARTPAGE, ENDPAGE) → PRICE
The database is redesigned to use the following schemas.
(VOLUME, NUMBER, STARTPAGE, ENDPAGE, TITLE, PRICE)
(VOLUME, NUMBER, YEAR)
Which is the weakest normal form that the new database satisfies, but the old one does not?
A
1NF
B
2NF
C
3NF
D
BCNF
4
GATE CSE 2015 Set 3
MCQ (Single Correct Answer)
+1
-0.3
Consider the relation $$X\left( {P,Q,R,S,T,U} \right)$$ with the following set of functional dependencies
$$\eqalign{ & F = \left\{ \, \right. \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\left\{ {P,R} \right\} \to \left\{ {S,T} \right\}, \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\left\{ {P,S,U} \right\} \to \left\{ {Q,R} \right\} \cr & \,\,\,\,\,\,\,\,\,\,\left. \, \right\} \cr} $$
Which of the following is the trivial functional dependency in $${F^ + },$$ where $${F^ + }$$ is closure of $$f$$ ?
A
$$\left\{ {P,R} \right\} \to \left\{ {S,T} \right\}$$
B
$$\left\{ {P,R} \right\} \to \left\{ {R,T} \right\}$$
C
$$\left\{ {P,S} \right\} \to \left\{ S \right\}$$
D
$$\left\{ {P,S,U} \right\} \to \left\{ Q \right\}$$
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