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UGC NET CS 2011 June-Paper-2
October 3, 2023
JNU PhD CS 2019
October 3, 2023
UGC NET CS 2011 June-Paper-2
October 3, 2023
JNU PhD CS 2019
October 3, 2023

Database-Management-System

Question 58

Given the basic ER and relational models, which of the following is INCORRECT?

A
An attribute of an entity can have more than one value
B
An attribute of an entity can be composite
C
In a row of a relational table, an attribute can have more than one value
D
In a row of a relational table, an attribute can have exactly one value or a NULL value
Question 58 Explanation: 
Option (A): In ER-model, multivalued attribute of an entity can have more than one value.
Option (B): In ER model, the attribute which can be further broken down into some other attributes is called composite attribute.
Option (C): In Relational model, the intersection of one row and column should contain only one value. So, option (C) is INCORRECT.
Option (D): In Relational model, the intersection of one row and column should contain either exactly one value or NULL.
Correct Answer: C
Question 58 Explanation: 
Option (A): In ER-model, multivalued attribute of an entity can have more than one value.
Option (B): In ER model, the attribute which can be further broken down into some other attributes is called composite attribute.
Option (C): In Relational model, the intersection of one row and column should contain only one value. So, option (C) is INCORRECT.
Option (D): In Relational model, the intersection of one row and column should contain either exactly one value or NULL.
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