Question: 1) What is the difference between logical data independence and physical data independence? Which one is harder to achieve? Why? 2) Why do we designate

1) What is the difference between logical data independence and physical data independence? Which one is harder to achieve? Why?

2) Why do we designate one of the candidate keys of a relation to be the primary key?

3) Discuss the entity integrity and referential integrity constraints. Why is each considered

important?

4) Why are duplicate tuples not allowed in a relation?

5) Discuss the ACID properties of database transactions.

6) DBAs must follow certain ethical principles to protect organisational data. Mention 5 ethical principles for database administrators.

7) Briefly explain a data ware house.

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