Suppose that a B + - tree index on branch-city is available on relation branch, and that

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Suppose that a B + - tree index on branch-city is available on relation branch, and that no other index is available. List different ways to handle the following selections that involve negation?

a. σ ¬ ((branch-city <“Brooklyn”)(branch)

b. σ ¬ (branch-city=“Brooklyn”)(branch)

c. σ ¬ ((branch-city <“Brooklyn” ∨ assets<5000)(branch)

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Database System Concepts

ISBN: 978-0072554816

4th Edition

Authors: Henry F. Korth, S. Sudarshan

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Question Posted: Jan 29, 2011 01:42 AM

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Suppose that a B + - tree index on branch-city is available on relation branch, and that

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a Use the index to locate the first tuple whose branchcity field ...View the full answer

Database System Concepts

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