Question

Data warehouses, as the name suggests, warehouse or store data. However, it is often overlooked that substantial efforts go into bringing data into the warehouse. This process is known as ETL, or extraction, transformation, and loading. Describe one of the ETL processes in detail and provide an example of it.

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Data transforming is a generic name of an ETL process which can include various tasks. Its scope depends on the selected application and the ETL tool/script used. For instance, it can assume a validation criterion for data before being loaded into the warehouse. Or, it can be simpler like transposing rows and columns in a database as preprocessing step. In many situations data originating from multiple sources must be merged in the warehouse or lookup to be performed on it. These two situations reveal common examples of data transforming through ETL....

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