X Functions - What Are They and How Do They Work?
This video delves into DAX X functions such as AVERAGEX, SUMX, MINX, MAXX, and CONCATENATEX, which are frequently used in Power BI solutions to build and iterate over virtual tables, processing row by row to aggregate results. It begins with a practical example illustrating how to calculate average sales per unit using an X function. The tutorial also explores how to inspect X functions with DAX Query View, create and filter virtual tables using SUMMARIZE and CALCULATETABLE, and apply CONCATENATEX for non-mathematical purposes like generating dynamic labels indicating which colors or filters are currently in context on drill-through pages. This walkthrough aims to provide a robust understanding of designing and debugging X functions for Power BI reports.
Video 1m
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