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One-to-Many Relationships

This type of relationship takes place when a single occurrence of an entity is related to many occurrences of a second entity.

For example, an employee works in one department; a department has many employees.

A One-to-Many relationship is shown on the diagram by a line connecting the two entities with a 'crow's foot' symbol denoting the 'many' end of the relationship.

One-to-Many Relationship

Next: Many-to-Many Relationships