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SUMX : An "iterator" function that performs a calculation row-by-row before summing the results.
: Practical examples show how to compare current performance against the past and handle tricky calculations like running totals or non-numeric values. Practical PowerPivot & DAX Formulas for Excel
: It contains over 250 downloadable DAX formulas that cover everything from basic filtering to complex statistical and time-intelligence functions. SUMX : An "iterator" function that performs a
In his book author Art Tennick provides a comprehensive guide for extracting actionable insights from massive corporate datasets. This "hands-on" resource is particularly noted for: Practical PowerPivot & DAX Formulas for Excel
If you're looking for the "power" in PowerPivot, these common DAX functions highlighted by expert resources like Microsoft Support and Analytics Vidhya are essential:
DATEADD : Used for time intelligence, such as calculating "Year-Over-Year" growth by shifting dates.