Union Transformation in Mapping Data Flow | Azure Data Factory Tutorial | Beginner Level

Union will combine multiple data streams into one, with the SQL Union of those streams as the new output from the Union transformation. All of the schema from each input stream will be combined inside of your data flow, without needing to have a join key.

You can combine n-number of streams in the settings table by selecting the "+" icon next to each configured row, including both source data as well as streams from existing transformations in your data flow.

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