A vertical bar on a line in crow's- foot notation means that there:
A) may be more than one of the entity.
B) might be one of the entity.
C) must be one of the entity.
D) is a mistake...there should not be anything but the crow's feet.

Question

Quizplus · Accepted Answer

In crow's-foot notation, a vertical bar indicates that the relationship is mandatory, meaning there must be at least one instance of the entity.

A Vertical Bar on a Line in Crow's- Foot Notation