Database-Management-System

Question 499

An entity has :
(i). a set of properties
(ii). a set of properties and values for all the properties
(iii). a set of properties and the values for some set of properties may non-uniquely identify an entity
(iv). a set of properties and the values for some set of properties may uniquely identify an entity
Which of the above are valid ?

A	(i) only
B	(ii) only
C	(iii) only
D	(iv) only

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

Question 499 Explanation:

An entity has a set of properties and the values for some set of properties may uniquely identify an entity.

Correct Answer: D

Question 499 Explanation:

An entity has a set of properties and the values for some set of properties may uniquely identify an entity.