For Exercises 1723, using the relation tables given before Exercise 7, express each

Chapter 5, Problem 20

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QUESTION:

For Exercises 17–23, using the relation tables given before Exercise 7, express each query in relational algebra, SQL, and relational calculus forms. Also give the result of each query.

20. Give the names of all authors who have written nature books.

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QUESTION:

For Exercises 17–23, using the relation tables given before Exercise 7, express each query in relational algebra, SQL, and relational calculus forms. Also give the result of each query.

20. Give the names of all authors who have written nature books.

ANSWER:

Step 1 of 3

The objective is to express each query in relational algebra, SQL, and relational calculus forms. Also, determine the result of the provided query.

Consider the statement, provides the names of all authors those are written nature books.

A database stores the details of an enterprise, and an entity relational model helps to represent an enterprise easily.

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