This article explains the roles of the formula engine and of the storage engine used to execute DAX queries.  Read more

This article describes the behavior of the DAX functions that manipulate sets; they are useful to create queries and sometimes also to author measures.  Read more

Great news! Just one year after releasing the second edition of The Definitive Guide to DAX, we just published a new website, a new book, and a new collection of videos: the second edition of DAX Patterns! DAX Patterns is…  Read more

Tabular models (including Power BI) require marking the Date table as a date table to get appropriate results with time intelligence calculations. This article explains why this setting is required.  Read more

VertiPaq Analyzer is a set of tools and libraries to analyze VertiPaq storage structures for a data model in Power BI and Analysis Services Tabular. In this webinar recorded for powerbi.tips, Marco Russo shows how VertiPaq Analyzer has been integrated…  Watch now

This article describes in which conditions the precedence of calculation groups might return unexpected results when filtering calculation items in both the visuals and the measures present in a report.  Read more

This article describes how to control format strings in calculation groups. Before starting, we suggest you read the previous articles in this series.  Read more

This article describes the types of relationships available in Power BI and Analysis Services, clarifying the differences in cardinality and filter propagation of physical relationships.  Read more

This article describes the reasons why an Excel pivot table may be slow when using the Analyze in Excel feature of Power BI.  Read more

Another year has gone by and it has now been 10 years since DAX was first introduced in late 2009. As usual, it is time to review the past year and to take a look at the year ahead.  Read more