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Database - ER Model and Business Rules - Discussion

Discussion Forum : ER Model and Business Rules - General Questions (Q.No. 10)
ER Model and Business Rules
10.
A supertype/subtype hierarchy has which of the following features?
Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.
Attributes are assigned at the highest logical level.
Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.
Attributes are assigned at the lowest logical level.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
2 comments Page 1 of 1.
Gajender bhati said:   9 years ago
Yes, the answer should be A.
Sam said:   10 years ago
Why not A?
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