How does the SUMX function (DAX) work?
The SUMX function (DAX) returns the sum of an expression evaluated for each row in a table.
SUMX Formula Syntax
How do you use the SUMX function?
It works through a table, row by row to complete the evaluation after applying all filters. SUMX() has awareness of rows in a table, and hence can reference the intersection of each row with any columns in the table. SUMX() can operate over a single column but can also operate over multiple columns too – because it has the ability to work row by row.
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Considerations when using the SUMX function
The SUMX function takes as its first argument a table, or an expression that returns a table. The second argument is a column that contains the numbers you want to sum, or an expression that evaluates to a column.
Only the numbers in the column are counted. Blanks, logical values, and text are ignored.
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Formula examples using the SUMX function
SUMX = SUMX(Sales,Sales[Qty] * Sales[Price Per Unit])
=SUMX( FactInternetSales, FactInternetSales[SalesAmount]-FactInternetSales[TotalProductCost] )