Database Management System Question Bank - 1
Question: 1
The most commonly used operation in relational algebra for projecting a set of tuple from a relation is
(A) Union
(B) Select
(C) Projection
(D) Join
Ans: B
Select
Question: 2
In E-R diagram, relationship is represented by
(A) Diamond shaped
(B) Dashed shaped
(C) Ellipse shaped
(D) Rectangle shaped
Ans : A
Diamond shaped
Question: 3
The _____ operation allows the combining of two relations by merging pairs of tubles, one from each relation, into a single tuple.
(A) Intersection
(B) Union
(C) Join
(D) Select
Ans: C
Join
Question: 4
A _____ is an abstract model that describes how the data are organised and represented.
(A) Database
(B) Schema
(C) Instances
(D) Data model
Ans: D
Data model
Question: 5
_____ describe what is in database fields.
(A) Field names
(B) Field definitions
(C) Field markers
(D) Structures
Ans: A
Field names
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