Please refer to the following diagram for Q19 to Q20. PERSON PK | P_ID |P_LNAME P_FNAME ΕMPLOYHΕ P_ID STUDENT P_ID STUDY_MAJOR РК, FKI РК, FK1 EMP HIRE DATE
Please refer to the following diagram for Q19 to Q20. PERSON PK | P_ID |P_LNAME P_FNAME ΕMPLOYHΕ P_ID STUDENT P_ID STUDY_MAJOR РК, FKI РК, FK1 EMP HIRE DATE
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Please refer to the following diagram for Q19 to Q20.
PERSON
PK P_ID
P_LNAME
P_FNAME
EMPLOYEE
P_ID
EMP_HIRE_DATE
STUDENT
P ID
STUDY_MAJOR
PK, FK1
PK, FK1

Transcribed Image Text:20. If P_Phone is an attribute of Person, then which of the following statements is/are true?
(1) Every Employee also has P_Phone as an attribute.
(2) A Student can have P_Phone number if only if he/she is not an Employee.
(3) The attribute P_Phone must also be defined in Student and Employee.
a. (1) only
b. (1) and (3) only
c. (2) and (3) only
d. (1), (2) and (3).
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