Sumx is the x version of the SUM function, this function takes two parameters.

The first parameter is a table name or any function which returns a table. And the second parameter is an expression to evaluate while this can be a column that need to be aggregated.

This function creates a row context in the given table and iterates over each row and evaluates the expression in the table.

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CALCULATE IN DAX

This article shows How to understand CALCULATE function in DAX. Calculate is one of the powerful functions in DAX language. This function will be a substitute for Excel’s SUMIF, COUNTIF, AVERAGEIF or ANYTHINGIF in reality. You can perform any kind of complex aggregate calculations using CALCULATE function.

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