Database Design Multiple Choice According to the ER/EER model we learned during
ID: 3866670 • Letter: D
Question
Database Design Multiple Choice
According to the ER/EER model we learned during our CLP class sessions, if we have an EER conceptual schema in which there is one cluster of subclasses that belongs to one superclass. In the circle that connects the vertical line(s) and the subclasses with their arrows, there is the letter "p" in it. What does this letter "p" mean? (a) The cluster is a total cluster. (b) The cluster is a disjoint cluster. (c) No superclass instance can be in any of the subclasses in any of the superclasses in that cluster. (d) "p" is not one of the legal values in that circle, as learned in class. (e) None of (a) through (d) is the correct answer.Explanation / Answer
Answer : c,d
c) No superclass instance can be in any of the subclasses in any of the superclasses in that cluster.
d) "p" is not one of the legal values in that circle as learned in class.
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