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 ...

Relationships and entity relationship diagrams A table in a database holds the attributes for one entity only. Data can then be added in the form of records.