This article shows a technique in DAX to compute the sales volume of products that were available right from the beginning of a selected time period, ignoring products introduced afterwards.  Read more

This article describes a counterintuitive behavior of BLANK in DAX measures affecting Power BI, Analysis Services, and Power Pivot. That behavior could cause mistakes in a report using alternate expressions of the same calculation. Indeed, these expressions are not equivalent…  Read more

This article describes how to extract raw data stored in the Tabular engine, used by Analysis Service Tabular, Power BI, and Power Pivot.  Read more

This article explains how to use KEEPFILTERS to intersect instead of overriding an existing filter context in DAX, simplifying the code and improving performance.  Read more

This article describes how to create a table with a series of numbers in DAX by using the new GENERATESERIES function or through a workaround using CALENDAR.  Read more

This article presents different techniques to compute a rownumber column in DAX based on a specific ranking, comparing slow and optimized approaches.  Read more

This article describes a number of techniques available to filter tables in DAX, showing possible pitfalls that you can avoid once you know them, in particular using bidirectional filters. One of the hardest things to do, when learning DAX, is…  Read more

This article describes how table expansion and filter context propagation are important DAX concepts to understand and fix small glitches in DAX expressions.  Read more

This article describes the differences in the levels available in Azure Analysis Services (Azure AS), comparing them with the features in SQL Server Analysis Services (SSAS) on-premises.  Read more

SQLBI offers a new introductory DAX video course called Introducing DAX. This article describes which users will benefit more from this learning experience, and how to enroll in the course.  Read more