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Author Question: A joining operation in which only the joining attribute from one site is transmitted to the other ... (Read 108 times)

kamilo84

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on: Jul 7, 2018
A joining operation in which only the joining attribute from one site is transmitted to the other site is called a(n):
 
  A) attribute linkup.
  B) key data element transfer.
  C) key data element join.
  D) semijoin.

Question 2

Discuss when one would use total specialization and when one would use partial specialization.
 
  What will be an ideal response?
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Amiracle

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Reply #1 on: Jul 7, 2018
Answer to Question 1

D

Answer to Question 2

Total specialization would be used when you know that there are no other subtypes of a supertype other than those defined. For example, if we only had undergraduate and graduate students but no other types of students, then we would use total specialization. However, if there were students other than graduate and undergraduate, such as just a general student, then we would want to use partial specialization.


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