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Thanks for the reply, I upload two images that describe the question. This is question 6.21 of the book "Database system concepts, 7th edition".

Thanks for the reply, I upload two images that describe the question. This is question 6.21 of the book "Database system concepts, 7th edition".

Computer Networking: A Top-Down Approach (7th Edition)
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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Thanks for the reply,

I upload two images that describe the question.

This is question 6.21 of the book "Database system concepts, 7th edition".

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6.21 Consider the E-R diagram in Figure 6.30, which models an online bookstore. a. Suppose the bookstore adds Blu-ray discs and downloadable video to its collection. The same item may be present in one or both formats, with dif- fering prices. Draw the part of the E-R diagram that models this addition, showing just the parts related to video. b. Now extend the full E-R diagram to model the case where a shopping bas- ket may contain any combination of books, Blu-ray discs, or downloadable video.
Transcribed Image Text:6.21 Consider the E-R diagram in Figure 6.30, which models an online bookstore. a. Suppose the bookstore adds Blu-ray discs and downloadable video to its collection. The same item may be present in one or both formats, with dif- fering prices. Draw the part of the E-R diagram that models this addition, showing just the parts related to video. b. Now extend the full E-R diagram to model the case where a shopping bas- ket may contain any combination of books, Blu-ray discs, or downloadable video.
author publisher name патe address address URL phone URL customer етail written_by пате published_by address phone book |питber ISBN title shopping_basket basket_of уear сontains basket_id price пиmber warehouse code stocks address phone Figure 6.30 E-R diagram for modeling an online bookstore.
Transcribed Image Text:author publisher name патe address address URL phone URL customer етail written_by пате published_by address phone book |питber ISBN title shopping_basket basket_of уear сontains basket_id price пиmber warehouse code stocks address phone Figure 6.30 E-R diagram for modeling an online bookstore.
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