How many columns will a relation resulting from mapping the Entity Y have?

A)2
B)3
C)4

Question

How many columns will a relation resulting from mapping the Entity Y have?

A)2 
B)3 
C)4

Quizplus · Accepted Answer

Without knowing the attributes and relationships of Entity Y it is impossible to determine how many columns the resulting relation would have. However, choice B (3) covers the most common scenario where an entity would map to a relation with at least two columns (one for the primary key and one for an attribute) and possibly a third column to represent a relationship with another entity.

How Many Columns Will a Relation Resulting from Mapping the Entity