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What is ETL
ETL is extraction,transformation and loading,ETL technology is used for extraction the information from the source database and loading it to the target database with the necessary transformations done in between.
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What are Data Marts
Data Mart is a segment of a data warehouse that can provide data for reporting and analysis on a section, unit, department or operation in the company, e.g. sales, payroll, production. Data marts are sometimes complete individual data warehouses which are usually smaller than the corporate data warehouse.