Power BI DAX Tutorial for Beginners (2025): Master DAX in ONE Course!
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Last Updated: October 18, 2026
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Summary
EXACT: Checks whether two text strings are exactly the same, and returns TRUE or FALSE. EXACT is case-sensitive. FIXED: Rounds a number to the specified number of decimals and returns the result as text with optional commas. We are proud to announce great news for FIRSTNONBLANK: Returns the first value in the column for which the expression has a non blank value. The DEFINE MEASURE statement introduces a measure definition in a query (also known as query measure). EVALUATE is a DAX statement that is needed to execute a query. GEOMEAN: Returns geometric mean of given column reference. SAMPLE: Returns a sample subset from a given table expression. SQRT: Returns the square root of a number. TOPN: Returns a given number of top rows according to a specified expression.