Question: 1. This question is about database logic. Answer all the following: A) Distinguish between logical and physical data independence, and give examples of possible changes

1. This question is about database logic. Answer all the following:

A) Distinguish between logical and physical data independence, and give examples of possible changes they allow.

B) Distinguish between the intension and extension of a database, and give some examples.

C) What is concurrency control and why does a DBMS need a concurrency control facility?

D) Define the term database integrity. How does database integrity differ from database security?

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