Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram?

A.

Diamonds with double/bold border

B.

Rectangles with double/bold border

C.

Ovals with double/bold border

D.

Ovals that contain underlined identifiers

Solution:

Option A: Diamonds with double/bold border represented as:

                  indicate weak entity relationship

Option B: Rectangles with double/bold border represented as:

                  indicate weak entity

Option C: Ovals with double/bold border represented as:

                  indicate Multivalued attribute

Option D: Ovals that contain underlined identifiers represented as:

                       indicate key attribute