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

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

In an Entity-Relationship Diagram, a Vertical Bar on the Lines