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

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Chapter 10. Two-Entity Shapes

Some shapes involve exactly two entities and some relationships. This chapter describes them.

Two Entities, One Relationship

Some shapes have one relationship between two entities.

One-many shapes

  • Plain one-many relationship

  • One-many relationship making a dependent or intersection entity

  • One-many relationship making a collection entity

One-one shapes

  • Plain one-one relationship

  • One-one relationship making a subordinate entity

  • To-be one-one relationship

  • Not-to-be one-one relationship

  • To-be one-one relationship making a subordinate entity

  • Plain to-be one-one relationship

  • Plain not-to-be one-one relationship

  • Not-to-be one-one relationship making a subordinate entity

Many-many shapes

  • Plain many-many relationship ...

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