ER-Model

Question 60

Aggregation is :

A	an abstraction through which relationships are treated as lower level entities.
B	an abstraction through which relationships are treated as higher level entities.
C	an abstraction through which relationships are not treated at all as entities.
D	none of the above

Database-Management-SystemER-ModelUGC NET CS 2008 Dec-Paper-2

Question 60 Explanation:

Aggregation: A directional between objects. When an object “has-a” another object, then you have got an aggregation between them, you have got an aggregation between them. Direction between them specified which object contains the other object.
Aggregation is an abstraction through which relationships are treated as higher level entities.

Note: Aggregation is an abstraction through which relationships are treated as higher level entities.

Correct Answer: B

Question 60 Explanation:

Aggregation: A directional between objects. When an object “has-a” another object, then you have got an aggregation between them, you have got an aggregation between them. Direction between them specified which object contains the other object.
Aggregation is an abstraction through which relationships are treated as higher level entities.

Note: Aggregation is an abstraction through which relationships are treated as higher level entities.