Bidirectional Relationships And Many-To-Many In The Power BI Designer

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Chris Webb's BI Blog

There’s a lot of cool stuff in the new Power BI Designer desktop app, but for me the most important new bit of functionality is one that’s not immediately obvious: relationships between tables in the data model have had a significant upgrade. Let me illustrate…

Bidirectional Relationships

First up: relationships can now filter in two directions. Consider the following two tables in an Excel workbook, a dimension table called Fruit and a fact table called Sales:

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When you first load these tables into the Power BI Designer no relationships are created between the tables. To create relationships you need to click on the Manage button on the Home tab so that the Manage Relationships dialog appears. You can then click the Autodetect button and the relationship between the two FruitID columns is created.

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However, click on the Edit button and you’ll see something interesting. In the Edit Relationship dialog, under…

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