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April 23, 2024

DAX Formula For Previous Month’s Values

There are indeed simpler ways to achieve the same result of calculating the previous month’s sales in DAX. One common approach is to use the PREVIOUSMONTH function combined with the CALCULATE function. Here’s how you can rewrite your DAX expression using this approach:

CALCULATE (
    SUM ( AW_Sales[Sales Amount] ),
    PREVIOUSMONTH ( AW_Calendar_Lookup[Date] )
)

This expression calculates the sum of sales amount for the previous month. The PREVIOUSMONTH function returns a table containing the dates from the previous month, and CALCULATE evaluates the expression in the context of that filtered table.

Using PREVIOUSMONTH simplifies your DAX expression and makes it more readable compared to using DATESBETWEEN. Both approaches should give you the same result, but PREVIOUSMONTH is often preferred for its simplicity and clarity.