Amsterdam, NLControlling empty or multiple selections in calculation groups
Marco Russo & Alberto FerrariThis article describes how to control the execution of DAX code when there are either multiple or empty selections of calculation items in calculation groups. Read more
Understanding the “can’t determine relationship between the fields” error in Power BI
This article explains why you might encounter a curious error when placing columns from unrelated tables in a Power BI matrix. Read more
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Video Training
Introducing DAX Video CourseFree
Direct Lake vs Import vs Direct Lake+Import | Fabric semantic models (May 2025)
Marco RussoWhen I presented “Choosing Between Import Mode, Direct Lake, and Composite Models” at Fabric Conf 2025 in Las Vegas, the room overflowed, and the session was not recorded. I promised to publish the material once the new Direct Lake + Import composite model… Read more
Tools in Power BI
Kurt BuhlerThis article gives an overview of some of the available tools that can help you create semantic models and reports. Read more
DAX Patterns
ABC classification
The ABC classification pattern classifies entities based on values grouping entities together that contribute to a certain percentage of the total A typical example of ABC classification is the segmentation of products entity based on sales value The best-selling products… More on DAX Patterns
SQLBI Corp.
Optimizing DAX, Second Edition
Optimizing DAX is the state-of-the-art book on optimizing DAX expressions in Power BI and Analysis Services semantic models.
Learn how to locate performance bottlenecks, read the query plan and performance metrics, rewrite the slower part of an expression, and measure the performance improvements. Read more