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A _____________ constraint requires that an entity belong to no more than one lower-level entity set.

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A _____________ constraint requires that an entity belong to no more than one lower-level entity set.

(a) Disjointness

(b) Uniqueness

(c) Special

(d) Relational

I got this question in a job interview.

This intriguing question originated from Extended E-R Features topic in chapter Database Systems Design and Implementation of Database Management

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Right answer is (a) Disjointness

The explanation is: For example, student entity can satisfy only one condition for the student type attribute; an entity can be either a graduate student or an undergraduate student, but cannot be both.

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