Within an entity-relationship diagram, which of the following would indicate that the relationship between A and B is one (A) to many (B)?
A) An arrow drawn from rectangle B points to rectangle A.
B) A line drawn from rectangle A ends in a crow's foot at rectangle B.
C) A line with a number 1 beside it is drawn from rectangle A to rectangle B.
D) A line with a letter n beside it is drawn from a diamond to rectangle A.

Question

Quizplus · Accepted Answer

A line ending in a crow's foot at one end indicates a "many" relationship in entity-relationship diagrams. When this crow's foot is at rectangle B, it signifies that for one instance of entity A, there can be many instances of entity B, thus representing a one-to-many relationship from A to B.

Within an Entity-Relationship Diagram, Which of the Following Would Indicate