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Generalization entity - PowerPoint PPT Presentation

Roles

Roles. Foreign Keys often play a more specific task in an entity than the entity where they are the primary key. Consider an employee that acts as a manager for a department. Department Model. Department. Employee. Depart Nbr(PK) Dept Name Dept Mgr(FK). Emp Nbr (PK) Emp Name Hire Date.

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Generalization entity - PowerPoint PPT Presentation

Roles