RationalDB 





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Weak and strong Aggregation

In strong aggregation a part entity cannot exist without the containing whole entity in the whole-part relationship. For example, university has multiple departments. This a composition relationship between the university and department entity. A department cannot exist on its own with out the university.


Weak aggregation: Players may participate in many teams at the same time.
Weak aggregation: Players may participate in many teams at the same time.

Strong aggregation: Chapters belong to a specific book. Without the book the chapters have no context and lose their meaning.
Strong aggregation: Chapters belong to a specific book. Without the book the chapters have no context and lose their meaning.