22 October, 2018
A workbook can contain multiple connections to multiple data sources. Each connection is listed at the top of the Data window. Each worksheet has a primary connection and can optionally have several secondary connections using data blending.
The primary connection and the secondary connections are linked by specified relationships. Adding a secondary connection to a sheet can be useful when you have data in multiple data sources that you want to integrate into a single analysis.
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Sometimes you may have data in two separate data sources that you want to analyze together on a single worksheet. While you can analyze several data sources together on the same worksheet, each worksheet must have a primary data source.
The primary data source is the connection that you first use in the view. After you drag fields to the view, the primary connection is marked with a blue check mark.
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