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10. Some employees serve as managers of employees in the firm. Most employees have a manager. It is possible an employee does not have a
10. Some employees serve as managers of employees in the firm. Most employees have a manager. It is possible an employee does not have a manager. An employee can manage many employees, but an employee may not manage any employees. If an employee has a manager, then the employee has only one manager. A manager is always an employee of the firm. (Hint: this is an example of a unary relationship.)
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