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Consider the schema for a flight schedule database that keeps track of carriers (such as British Air), Airports (such as
Posted: Sun May 15, 2022 1:29 pm
by answerhappygod
- Consider The Schema For A Flight Schedule Database That Keeps Track Of Carriers Such As British Air Airports Such As 1 (44.7 KiB) Viewed 71 times
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.