In an entity-relationship diagram,a vertical bar on a line indicates that at least one entity of that type is required in the relationship.

Name: In an entity-relationship diagram,a vertical bar on a line indicates that at least one entity of that type is required in the relationship.
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A vertical bar represents a mandatory participation constraint, which means at least one entity of that type is required in the relationship.

In an Entity-Relationship Diagram,a Vertical Bar on a Line Indicates