Consider the bank database of Figure 15.14, where the primary keys are underlined. Suppose that a B+-tree index on branch city is available on relationbranch, and that no other index is available. List different ways to handle thefollowing selections that involve negation: σ ¬(branch_city<“Brooklyn”)(branch) branch(branch_name, branch.city, assets)customer (customer-name, customer-street, customercity)loan (loan_number, branch_name, amount)borrower (customer_name, loan-number)account (account_number, branchname, balance)depositor (customer_name, account_number)Figure 15.14 Bank database.

Different way to handle the given selection: In the above selection, select negation of…

Answered: branch(branch_name, branch.city,…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the bank database of Figure 15.14, where the primary keys are underlined. 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: σ _{¬(branch_city<“Brooklyn”)}(branch)

branch(branch_name, branch.city, assets)
customer (customer-name, customer-street, customercity)
loan (loan_number, branch_name, amount)
borrower (customer_name, loan-number)
account (account_number, branchname, balance)
depositor (customer_name, account_number)
Figure 15.14 Bank database.

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