According to the data model, is it required that every entity instance in the PRODUCT table be associated with an entity instance in the CD table? Why or why not?

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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According to the data model, is it required that every entity instance in the PRODUCT table be associated with an entity instance in the CD table? Why or why not?

PRODUCT
PK Prod Num
Prod_Title
Prod_ReleaseDate
Prod_Price
Prod_Type
Prod_Type
BOOK
CD
MOVIE
PK,FK1 Prod_Num
PK,FK1 Prod_Num
PK,FK1 Prod Num
Book CoverType
Book PageCount
CD_Genre
CD Artist
Movie_Rating
Movie_Director
Transcribed Image Text:PRODUCT PK Prod Num Prod_Title Prod_ReleaseDate Prod_Price Prod_Type Prod_Type BOOK CD MOVIE PK,FK1 Prod_Num PK,FK1 Prod_Num PK,FK1 Prod Num Book CoverType Book PageCount CD_Genre CD Artist Movie_Rating Movie_Director
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