Use this EER to transfer to the mapping of union types

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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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
Transcribed Image Text: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

 

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