Data analysis is frequently done in layers, with each layer of analysis using or building on the previous layer. When you build a pivot table using the results of a Power Query output, you are layering your analysis. When you build a query based on a table created by an SQL Server view, you are also creating a layered analysis.
You'll often find the need to build queries on top of other queries to get the results you're seeking. That's what this chapter is all about. Here you'll take a look at a few ways that you can advance your data analysis by making your queries work together.
It's common to rely on the same main data table for all kinds of analysis. Even the simple table shown in Figure 40.1 can be used to create different views: sales by employee, sales by business segment, sales by region, and so forth.
FIGURE 40.1 This data can be used as the source for various levels of aggregated analysis. ...
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