Database - ER Model and Business Rules - Discussion

Discussion :: ER Model and Business Rules - General Questions (Q.No.5)

5. 

A supertype/subtype hierarchy is which of the following?

[A]. Each subtype has only one attribute.
[B]. Each supertype has only one attribute.
[C]. Each subtype has only one supertype.
[D]. Each supertype has only one subtype.

Answer: Option C

Explanation:

No answer description available for this question.

Darshana said: (Dec 1, 2013)  
Since supertype can be accessed by each subtype.

Sunil said: (Apr 14, 2014)  
Please tell me a difference between subtype and supertype.

I don't understand this concept.

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