Use the ER Diagram shown on Figure 1 to answer question 5: 5. According to the ER diagram on Figure 1, which of the following is true? A) Phone is a derived attribute. B) Age is a candidate key. C) Bonus is a multivalued attribute. D) None of the above. Answer: Age EmpID DateOfBirth Email Skill Phone EMPLOYEE YearWithCo LName (FullName) DateOfHire SSN Bonus (0) FName Salary

Use the ER Diagram shown on Figure 1 to answer question 5: 5. According to the ER diagram on Figure 1, which of the following is true? A) Phone is a derived attribute. B) Age is a candidate key. C) Bonus is a multivalued attribute. D) None of the above. Answer: Age EmpID DateOfBirth Email Skill Phone EMPLOYEE YearWithCo LName (FullName) DateOfHire SSN Bonus (0) FName Salary

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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It is possible to have both a primary key and a candidate key for the same attribute.
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Explain why an index is only helpful if an attribute's values cover a suitable range. This is the only scenario when an index is relevant.
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What is the difference between an attribute with numerous values and a recurring group?
WHAT IS THE RELATIONSHIP THIS TABLE ZERO TO MANY OPTIONAL ? ONE TO MANY ? ONE MANDATORY ? ONE TO ONE ? ONE ? ZERO TO ONE ? MANY ? MANY TO MANY ? ONE OPTIONAL TO MANY OPTIONAL ? ONE MANDATORY TO MANY OPTIONAL ? MANY)
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Explain why an index is only effective when an attribute's values cover a suitable range of values. This is the sole situation in which an index is helpful.
In an ERD, entities do not have columns. Instead which of the following is used to describe the entity's characteristics? Group of answer choices attributes degrees instances relationships
Given the following ERD. ID name salary Instructor Grades teaches ID name salary Student 1) What is the descriptive attribute of the relationship between instructor and student? 2) Is this relationship a one-to-one, a one-to-many, or a many-to-many relationship?