Question 61: Let's say we want to implement the following schema:

Enity: Staff Member (id , name)

Enity: Permanent (specialises Staff Member) (next_appraisal_date )

Enity: Temporary (specialises Staff Member) (contract_end_date)

A Staff Member is either a Permanent employee or a Temporary contractor. How do you define disjoint in parent child relationship?

1. An entity can only participate in only one subtype role
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Correct Answer : 1

Exp : It means Temporary employee cannot be part of permanent employee. 

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