Question: Basic DataBase: 1. What is an entity supertype, and why is it used? 2. What is a subtype discriminator? Given an example of its use.

Basic DataBase:

Basic DataBase: 1. What is an entity supertype, and why is it

1. What is an entity supertype, and why is it used? 2. What is a subtype discriminator? Given an example of its use. 3. There two category symbols: overlapping subtype, nonoverlapping subtypes (disjoint subtype) What is an overlapping subtype? Give an example. What is a disjoint subtype? Give an example: 4. What is the difference between partial completeness and total completeness

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