Once relationships have been defined in your data model, filtering occurs automatically and this adds a tremendous amount of value to Power BI. However, the analytical value achieved through many-to-many relationships does not happen automatically.
Before you can learn how to handle many-to-many relationships in Power BI, you must first understand the basic behavior of filtering. Let's take a minor detour to explain how filtering works. Filtering will be discussed in more detail in the next chapter. In Figure 8, the total SalesAmount of all transactions is $29,358,677.22. The table visual you see in Figure 8 is simply the sum of the column SalesAmount from the FactInternetSales table:
Figure 8- SalesAmount
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