In an E-R diagram, a(n) ________ on a line means that at least one entity of that type is required.
A) small oval
B) vertical bar
C) arrow
D) triangular block
E) wave

Question

Quizplus · Accepted Answer

The vertical bar on a line in an E-R diagram represents a mandatory relationship, meaning that at least one entity of that type is required. The small oval represents a derived attribute, the arrow represents a one-to-many relationship, the triangular block represents an isa relationship, and the wave represents a recursive relationship.

In an E-R Diagram, A(n) ________ on a Line Means