One of the key knowledge that everyone using Power BI needs to fully master is when to use SUM and SUMX. Here, I will be explaining the differences between these two DAX measures so you will know when to use SUM or SUMX when looking at a particular model.

***** Video Details *****
1:06 explaining two calculating functions: aggregating and iterating functions
2:02 using SUM as aggregating function
3:02 the difference in using SUMX as iterating function
6:21 The rule I use in choosing which function to use: aggregating or iterating function

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