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DAX SUM Function

In Power BI, the DAX (Data Analysis Expressions) SUM function is used to calculate the sum of values in a column or expression. It aggregates numerical values and returns the total sum. Here's how it works and how you can use it effectively:

Syntax:

SUM(<column>)

<column>: The column or expression for which you want to calculate the sum.


Purpose:

The SUM function is primarily used for aggregation purposes in Power BI. It allows you to sum up numeric values across rows in a column or based on a specific expression.


Example:

Suppose you have a table named "Sales" with columns "Product" and "Revenue". You want to calculate the total revenue generated from all products.


You can use the SUM function as follows:

TotalSales = SUM(Sales[SalesAmount])

This formula calculates the sum of the "SalesAmount" column in the "Sales" table, giving you the total revenue.

So, the total sales amount across all products is 750.



Considerations:

Filter Context: The SUM function respects the filter context applied to the data. It calculates the sum based on the current filter context, which may include slicers, filters, or row-level security.

Aggregation: If your column contains blank or null values, the SUM function ignores those values while calculating the sum.

Implicit Measures: In Power BI, you can also use the SUM function implicitly. When you drag a numeric column into a visualization (e.g., a table or a chart), Power BI automatically applies the SUM function to aggregate the values.


Use Cases:

Calculating total sales, revenue, or quantity sold.

Aggregating numeric measures such as costs, profits, or expenses.

Summing up values across multiple columns or tables using calculated expressions.

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