Question 13 Which of the following about enhanced entity relationship modeling is/are correct? Select all that apply (note: partial (positive or negative) credits are assigned to partially correct or incorrect answers respectively; minimum score of the question is zero). When subtypes are overlapping, an additional field must be added to the supertype to act as a discriminator. Subtypes at the lowest level of a hierarchy do not inherit attributes from their ancestors. ✔ In a supertype / subtype hierarchy, attributes are assigned at the highest logical level that is possible in the hierarchy. Regardless of the business situation, a member of the supertype is always a member of more than one subtype. A subtype can become a supertype if the subtype has other subtypes beneath it.

Question 13 Which of the following about enhanced entity relationship modeling is/are correct? Select all that apply (note: partial (positive or negative) credits are assigned to partially correct or incorrect answers respectively; minimum score of the question is zero). When subtypes are overlapping, an additional field must be added to the supertype to act as a discriminator. Subtypes at the lowest level of a hierarchy do not inherit attributes from their ancestors. ✔ In a supertype / subtype hierarchy, attributes are assigned at the highest logical level that is possible in the hierarchy. Regardless of the business situation, a member of the supertype is always a member of more than one subtype. A subtype can become a supertype if the subtype has other subtypes beneath it.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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