Question: 1 . What is an entity supertype, and why is it used? 2 . Describe what is meant by a specialisation hierarchy? 3 . What

1. What is an entity supertype, and why is it used?
2. Describe what is meant by a specialisation hierarchy?
3. What is a subtype discriminator? Given an example of its use.
4. What is an overlapping subtype? Give an example.
5. What is a disjoint subtype? Give an example
6. What is the difference between partial completeness and total completeness?

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