Computer Science - Database Systems - Discussion

20. 

A top-to-bottom relationship among the items in a database is established by a

[A]. Hierarchical schema
[B]. Network schema
[C]. Relational schema
[D]. All of the above
[E]. None of the above

Answer: Option A

Explanation:

No answer description available for this question.

Arun Rajput said: (Jun 3, 2018)  
E-R model is a top-down approach,
A specialization is a top-down approach.
But;
A generalization is a bottom-up approach.

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