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Itabhyas Online Training Is The Best Etl Testing Online Training In Usa, Uk, Australia, Canada And India. extract, Transform & Load Is A Process In Data Warehousing. Etl Refers To, "extraction Of Data From Different Applications" Developed & Supported By Different Vendors, Managed & Operated By Different Persons Hosted On Different Technologies "into Staging Tables-transform Data From Staging Tables By Applying A Series Of Rules Or Functions - Which May Include Joining And Reduplication Of Data, Filter And Sort The Data Using Specific Attributes, Transposing Data, Make Business Calculations Etc - To Derive The Data For Loading Into The Destination System-loading The Data Into The Destinati