3.4. Which statements are correct? a. A weak entity type can only have one attribute type. b. A weak entity type is always existence-dependent. c. An existence-dependent entity type is always a weak entity type. d. An existence-dependent entity type always participates in a 1:1 relationship type.

3.4. Which statements are correct? a. A weak entity type can only have one attribute type. b. A weak entity type is always existence-dependent. c. An existence-dependent entity type is always a weak entity type. d. An existence-dependent entity type always participates in a 1:1 relationship type.

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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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

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3.4. Which statements are correct?
a. A weak entity type can only have one attribute type.
b. A weak entity type is always existence-dependent.
c. An existence-dependent entity type is always a weak entity type.
d. An existence-dependent entity type always participates in a 1:1 relationship type.

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