It is necessary to include relationship descriptions like this when creating an entity relationship diagram. If we added a third entity (Sport), we would have another relationship to add.

The grammars used to generate entity-relationship diagrams and object-oriented conceptual models, for example, provide separate constructs for representing entities and attributes. The grammars used ...

In building a logical data model, some entities are considered strong, other entities are considered weak. Strong entities are the most foundational elements within a nascent Entity-Relationship ...