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Principles of Data Integration
Penulis: AnHaiDoan •
Identifier: --anhaidoan-1139
Finally,therepresentationofthedatacanbesigniï¬Âcantlydifferentaswell.Forexample, inFullServe’sEmployeedatabase,thecompanyrecordstheï¬Ârst,middle,andlastnameof everyemployeeinaseparateï¬Âeld.IntheTrainingdatabase,itonlyrecordsthefullnameof theemployeeinasingleï¬Âeld,andasaresult,namesoftenoccurinvariousformats,suchas (First,Last)or(Last,FirstInitial).Consequently,itmaybehardtomatchrecordsfromthese twodatabases.ThesameproblemoccursbetweentheSalesandServicesdatabases.While the Sales database only records a ï¬Âeld for the name and a ï¬Âeld for the address, the Services database records much ï¬Âner-grained information about each subscriber. Of course, the units of measure will differ as well: FullServe uses American dollars for prices, while EuroCardusesEuros.Sincetheexchangeratebetweenthecurrenciesconstantlychanges, thecorrespondencebetweenthevaluescannotbesetapriori.