This article shows two techniques based on calculation groups: how to implement dynamic format strings in regular measures, and how to perform weight conversion on the fly.  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

A Date table in Power BI can have a smaller number of columns by leveraging custom format strings to adequately control the chart visualization and the sort order.  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

Power BI offers several options to create filters and slicers in a report. However, it is not possible to define a default filter at the model level so that every new report on a dataset automatically applies that filter. The…  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

The LOOKUPVALUE function retrieves values from a table in a simple way, but it involves a hidden level of complexity. This article provides full coverage of the LOOKUPVALUE internals, alongside several performance considerations.  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

Learn how to create your first calculation group in Power BI Desktop using Tabular Editor in this step-by-step video.  Watch now