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Mastering Data Modeling: A User-Driven Approach by John Carlis

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Chapter 11. Shapes with More Than Two Entities

Some shapes involve more than two entities and two or more relationships. This chapter describes them:

  • Chicken feet in

  • Chicken feet out

  • Chicken feet across

  • Subordinates out

  • Subordinates across

  • Multiple to-be relationships

  • Multiple short paths

Shape: Chicken Feet In

If an entity has two or more degree-one links of one-many relationships, the entity participates in the chicken-feet-in shape—so named because there are many chicken feet touching the entity. The most common form of chicken feet in has three entities, as in Fragments 11-1 through 11-5.

Image

Fragment 11-1

Fragment 11-2

Fragment ...

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