CENTRAL SCHOOL LIBRARY
Observe the ER diagram for the CENTRAL SCHOOL LIBRARY

-How many optional columns will the relational schema mapped from the Central School Library ER diagram have?
A)0
B)1
C)2

Question

CENTRAL SCHOOL LIBRARY
Observe the ER diagram for the CENTRAL SCHOOL LIBRARY
 
-How many optional columns will the relational schema mapped from the Central School Library ER diagram have?
A)0 
B)1 
C)2

Quizplus · Accepted Answer

In a relational schema mapped from an ER diagram, optional columns are those that can have null values. The number of optional columns depends on the specific attributes and relationships in the ER diagram. Without additional information about the ER diagram, the default assumption is that there are no optional columns.

CENTRAL SCHOOL LIBRARY Observe the ER Diagram for the CENTRAL SCHOOL LIBRARY