Explain what ETL is and the challenges posed by it and how would you address?
ETL stand for Extract Transform and load
ETL is tool by which you can load your data from several source to one destination.
ETL is mainly used in data warehouse.
Famous ETL tools are listed below
OWB(Oracle Warehouse Builder )
It is not easy to maintain and build the proficient ETL there are some drawback and complexity in it.
Like mapping of source into staging.
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