Question

II. Explain briefly. Answer any TEN questions.
(10 x 4 = 40)
1. What are the characteristics of a database?
2. Briefly explain about data abstraction.
3. Write a short note on data independence.
4. What do you mean by cardinality?
5. Write a note on database schema.
6. What are derived attributes?​

Answer 1

Answer:

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Answer 2

Explanation:

Pure calcium carbonate can be produced from marble, or it can be prepared by passing carbon dioxide into a solution of calcium hydroxide. In the later case calcium carbonate is derived from the mixture, forming a grade of product called "precipitated calcium carbonate,” or PCC.