Consider an online auction database system in which members (buyers and sellers) participate in the sale of items. The data requirements for this system are summarized as follows: Members The online site has members who are identified by a unique member id and are described by an email address, their name, a password, their home address, and a phone number. Supertype and Subtypes for Members A member may be a buyer or a seller, but not both (disjoint subtype).  A member must be one or the other (mandatory or required participation). A buyer has a shipping address recorded in the database. A seller has a bank account number and routing number recorded in the database. Both buyer and seller subtypes (entities) share the primary key with members which is membered. Items Items are placed by a seller for sale and are identified by a unique item number assigned by the system. Items are also described by an item title, an item description, a starting bid price, bidding increment, the start date of the auction, and the end date of the auction. Items also have a classification attribute which classifies the item as a type. Many to many relationship Buyers place one to many bids on items.  Items have one to many bids from buyers.  This is a many to many relationship and you need to add a “linking” or “Associative” third table between Items and Buyers with a TransactionID (primary key) membered (from the buyertable) – foreign key, ItemID – foreign key, and a bidding price and date/time stamp of the bid.  Draw an enhanced entity-relationship diagram

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...
icon
Related questions
Question
100%

Consider an online auction database system in which members (buyers and sellers)

participate in the sale of items. The data requirements for this system are summarized as

follows:

Members

The online site has members who are identified by a unique member id and are

described by an email address, their name, a password, their home address, and a

phone number.

Supertype and Subtypes for Members

A member may be a buyer or a seller, but not both (disjoint subtype).  A member must be one or the other (mandatory or required participation). A buyer has a shipping address recorded in the

database. A seller has a bank account number and routing number recorded in the

database. Both buyer and seller subtypes (entities) share the primary key with members which is membered.

Items

Items are placed by a seller for sale and are identified by a unique item number

assigned by the system. Items are also described by an item title, an item description,

a starting bid price, bidding increment, the start date of the auction, and the end date

of the auction. Items also have a classification attribute which classifies the item as a type.

Many to many relationship

Buyers place one to many bids on items.  Items have one to many bids from buyers.  This is a many to many relationship and you need to add a “linking” or “Associative” third table between Items and Buyers with a TransactionID (primary key) membered (from the buyertable) – foreign key, ItemID – foreign key, and a bidding price and date/time stamp of the bid. 

Draw an enhanced entity-relationship diagram 

Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps with 1 images

Blurred answer
Recommended textbooks for you
Computer Networking: A Top-Down Approach (7th Edi…
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Concepts of Database Management
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
Prelude to Programming
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
Sc Business Data Communications and Networking, T…
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY