Answered: Consider the schema for a flight…

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 schema for a flight schedule database that keeps track of carriers (such as British Air), Airports (such as JFK Airport), and flights schedule (such as Flight 124 from Atlanta to London and its carrier is British Air).

Airport(AID,AName,ACity,ACountry)

Carrier(CID,CName,CCity,CCountry)

Flight(FromAirport,ToAirport,Date,CID)

Draw the initial query tree that corresponds to the following SQL query and then show how the query tree is optimized using heuristics:

Select F.AName as FName, T.AName as TName, CName

From Airport as F, Airport as T, Flight, Carrier

Where F.AID=Flight.FromAirport and T.AID=Flight.ToAirport and

Flight.CID=Carrier.CID and Flight.Date=’1/1/2015’

You must show all the optimization steps and comment on each step.

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