A supertype/subtype hierarchy is which of the following?(a) Each subtype has only one attribute(b) Each supertype has only one attribute(c) Each subtype has only one supertype(d) Each supertype has only one subtypeThis question was posed to me in a national level competition.This intriguing question comes from The Atomic Data Models and Business Models topic in section Planning Oracle Applications of Oracle

A supertype/subtype hierarchy is which of the following?(a) Each subty

1.	A supertype/subtype hierarchy is which of the following?(a) Each subtype has only one attribute(b) Each supertype has only one attribute(c) Each subtype has only one supertype(d) Each supertype has only one subtypeThis question was posed to me in a national level competition.This intriguing question comes from The Atomic Data Models and Business Models topic in section Planning Oracle Applications of Oracle
Answer» <html><body><p>Right <a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> is (c) Each subtype has only one supertype<br/><br/>Easy explanation: Two <a href="https://interviewquestions.tuteehub.com/tag/entities-972724" style="font-weight:bold;" target="_blank" title="Click to know more about ENTITIES">ENTITIES</a> are of <a href="https://interviewquestions.tuteehub.com/tag/distinct-432063" style="font-weight:bold;" target="_blank" title="Click to know more about DISTINCT">DISTINCT</a> types if they have no attributes in common. It is <a href="https://interviewquestions.tuteehub.com/tag/possible-592355" style="font-weight:bold;" target="_blank" title="Click to know more about POSSIBLE">POSSIBLE</a> for entities to have both common and distinct attributes. If they have a common identifier (that is, a common primary <a href="https://interviewquestions.tuteehub.com/tag/key-11608" style="font-weight:bold;" target="_blank" title="Click to know more about KEY">KEY</a>), they have a special supertype-subtype relationship: they are neither distinct nor the same.</p></body></html>

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