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Answer the following questions (250 words max/question). a. Explain the concept of program-data independence, and explain how it is achieved in the database approach. b.
Answer the following questions (250 words max/question). a. Explain the concept of program-data independence, and explain how it is achieved in the database approach.
b. Briefly contrast and compare the following development approaches:
the systems development life cycle and the prototyping methodology.
c. Discuss the difference between entity type and entity instance.
Question 2 Give a simple example of an E-R diagram for each of the following concepts:
a. Associative entity
b. Weak entity
c. Unary relationship
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