Use this EER to transfer to the mapping of union types EERDgenderphoneNoemailIDcountryNameParticipantheightParticipant TypecertificateweighRDateAccomNameageAddressAthletes"athletes""соach"Сoach(0,500)joinResults(1, 56)(1, M)MM(1, M)MatchScheduleM(1,4)holdm_declare1(0,9)c_deciare(0, 5630)Venue(0, 250)NationTeam1Sport

Answered: Use this EER to transfer to the mapping…

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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Related questions

Question

Use this EER to transfer to the mapping of union types

EERD
gender
phoneNo
email
ID
country
Name
Participant
height
Participant Type
certificate
weigh
RDate
AccomName
age
Address
Athletes
"athletes"
"соach"
Сoach
(0,500)
join
Results
(1, 56)
(1, M)
M
M
(1, M)
MatchSchedule
M
(1,4)
hold
m_declare
1
(0,9)
c_deciare
(0, 5630)
Venue
(0, 250)
NationTeam
1
Sport

Expert Solution

Step 1

For mapping a category whose defining superclass have different keys, it is customary to specify a new key attribute,
called a surrogate key, when creating a relation to correspond to the category.

IN the above scenario we can see that when we create relation participant corresponding to participant category .the primary key of ID in participant become surrogate key in Athlete and coach