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One-to-many relationship

Connects an entity of one type to zero or more entities of another (or same) type.


  • Entity types: Employee, Department.
  • An Employee works for exactly one Department.
  • A Department has zero or more Employees.

  • Arrow points to the one side.
  • Connecting lines may indicate cardinality.
Or omit the diamond

Note on Terminology

Many means zero or more.

E.g., A Department can have zero Employees, one, or more.

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