Question

To convert a many - many relationship R from entity set E to entity set F, we must __________

Select one:
a. Create two relations for E and F entity sets perspectively, and add the key attributes of E to F
b. Create two relations for E and F entity sets perspectively, and create one relation more for relationship R by adding all attributes of relationship R if there is any
c. Create two relations for E and F entity sets perspectively, and add the key attributes of F to E
d. Create two relations for E and F entity sets perspectively, and create one relation more for relationship R by adding the key attributes of E and F, and the other attributes of relationship R

Answer 1

To convert a many-many relationship between entity sets E and F into database relations, three different relations are created: one for each entity set and a third relation for the relationship R that includes the key attributes of both E and F, along with any additional attributes of R. Therefore, the correct multiple-choice option is (d).

Step-by-step explanation:

To convert a many-many relationship R from entity set E to entity set F, we must create three different relations. The correct answer is:

d. Create two relations for E and F entity sets respectively, and create one relation more for relationship R by adding the key attributes of E and F, and the other attributes of relationship R.

This means we need to have two separate relations or tables for each entity set, E and F, and a third relation for the many-many relationship R itself. This relation R will include the key attributes (or primary keys) from both E and F entity sets, as well as any other descriptive attributes that are part of the relationship.

This third relation essentially serves as a link table that facilitates the connection between E and F, allowing for the representation of the many-to-many relationship between them. It is important that it contains the key attributes to uniquely identify each relationship that exists between an instance of E and an instance of F.

Therefore, the correct multiple-choice option is (d).