In an entity-relationship diagram,a ________ on a line means that at least one entity type of that type is required.
A)small oval
B)vertical bar
C)crow's foot
D)key

Name: In an entity-relationship diagram,a ________ on a line means that at least one entity type of that type is required. A)small oval B)vertical bar C)crow's foot D)key
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A vertical bar on a line in an entity-relationship diagram indicates that at least one entity of that type is required, representing a mandatory relationship.

In an Entity-Relationship Diagram,a ________ on a Line Means That