Exercise 12.4 Consider the following schema with the Sailors relation: Sailors(sid: integer, sname: string, rating: integer, age: real) For each of the following indexes, list whether the index matches the given selection conditions. If there is a match, list the primary conjuncts. A B+-tree index on the search key < Sailors.sid >.  σSailors.sid<50,000(Sailors) σSailors.sid=50,000(Sailors) A hash index on the search key < Sailors.sid >.  σSailors.sid<50,000(Sailors) σSailors.sid=50,000(Sailors) A B+-tree index on the search key < Sailors.sid, Sailors.age >.  σSailors.sid<50,000∧Sailors.age=21(Sailors) σSailors.sid=50,000∧Sailors.age>21(Sailors) σSailors.sid=50,000(Sailors) σSailors.age=21(Sailors) A hash index on the search key < Sailors.sid, Sailors.age >.  σSailors.sid=50,000∧Sailors.age=21(Sailors) σSailors.sid=50,000∧Sailors.age>21(Sailors) σSailors.sid=50,000(Sailors) σSailors.age=21(Sailors) (note that the book has a typo for part 4, answer for hash index only)

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
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Exercise 12.4 Consider the following schema with the Sailors relation:

Sailors(sid: integer, sname: string, rating: integer, age: real)

For each of the following indexes, list whether the index matches the given selection conditions. If there is a match, list the primary conjuncts.

A B+-tree index on the search key < Sailors.sid >. 

σSailors.sid<50,000(Sailors)

σSailors.sid=50,000(Sailors)

A hash index on the search key < Sailors.sid >. 

σSailors.sid<50,000(Sailors)

σSailors.sid=50,000(Sailors)

A B+-tree index on the search key < Sailors.sid, Sailors.age >. 

σSailors.sid<50,000∧Sailors.age=21(Sailors)

σSailors.sid=50,000∧Sailors.age>21(Sailors)

σSailors.sid=50,000(Sailors)

σSailors.age=21(Sailors)

A hash index on the search key < Sailors.sid, Sailors.age >. 

σSailors.sid=50,000∧Sailors.age=21(Sailors)

σSailors.sid=50,000∧Sailors.age>21(Sailors)

σSailors.sid=50,000(Sailors)

σSailors.age=21(Sailors)

(note that the book has a typo for part 4, answer for hash index only)

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