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This video tutorial introduces the concept of adding derived columns in a copy activity in Azure Data Factory. The tutorial explains that copy activity is useful for copying data from a source to a destination, and is cost-effective in terms of DIU prices. However, copy activity does not directly support adding derived columns based on source columns. Instead, it allows for adding extra columns independently of the source columns. The tutorial demonstrates how to use copy activity to add extra columns, but not derive columns based on existing data.
