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Chapter 5, Problem 14(choose chapter or problem)
For Exercises 7–16, use the following relation tables and write the results of the operations. These tables are sorted by primary key (or in the case of the Writes table, by the first component of the primary key), which is not required but is useful for Exercise 25. Many database systems maintain data in sorted order by primary key using a tree structure (see Section 5.1, Exercise 43).
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QUESTION:
For Exercises 7–16, use the following relation tables and write the results of the operations. These tables are sorted by primary key (or in the case of the Writes table, by the first component of the primary key), which is not required but is useful for Exercise 25. Many database systems maintain data in sorted order by primary key using a tree structure (see Section 5.1, Exercise 43).
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ANSWER:Step 1 of 2
The common two operations performed on any relation are restrict and project. The project operation is used to create a new relation that has a subset of columns of the original relation. A few attributes of the relation are selected using the project operation.
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