This article describes the syntax and the use cases of the DEFINE COLUMN statement in DAX.  Read more

At the end of a year marked by the pandemic, it is time for our usual review of what happened in the DAX realm. The enthusiasm we typically demonstrate in this traditional end-of -year post is tainted this year by…  Read more

This article shows techniques to obtain a ranking based on more than one column. The ranking can be both static and dynamic.  Read more

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

This article explains why in many cases, MAX should be used instead of LASTDATE to search for the last date in a time period using DAX.  Read more

This article describes how to use calculation groups to dynamically replace only a partial expression in a complex DAX calculation.  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

A pattern is a general, reusable solution to a frequent or common challenge. This book is the second edition of the most comprehensive collection of ready-to-use solutions in DAX, that you can use in Microsoft Power BI, Analysis Services Tabular,…  Read more

DAX is simple, but it is not easy. I cannot remember how many times I read this sentence on social media, attributed to me. For good reason: I have repeated this sentence at almost every classroom course I delivered over…  Read more