-
Applying security roles to a Power BI model or to an SSAS Tabular database might impact query performance. This article describes existing issues and possible workarounds. This is an advanced article; a good knowledge of the storage engine and formula… Read more
-
This article describes how to define optional parameters in DAX user-defined functions and set default values for parameters not specified by the caller. Read more
-
DAX offers many functions to remove filters from the filter context. In this article, we analyze the differences among the most commonly-used functions. Read more
-
This article describes the new Expression Context property of calculated columns in Power BI, explaining how user-aware calculated columns work, why they are not materialized, and how to use them as virtual calculated columns for localization and custom security scenarios. Read more
-
A slicer cannot filter a measure. In this article, we analyze this common request by explaining how to use a slicer to filter a measure, after discussing the real meaning of using a measure with a slicer. Read more
-
This article describes the parameter types available in DAX user-defined functions, focusing on the specialized reference types MEASUREREF, COLUMNREF, TABLEREF, and CALENDARREF. Read more
-
Visual calculations can be used efficiently to format visuals. This article presents an interesting technique to highlight a row based solely on the maximum value in the last column. Read more
-
We released a new session in SQLBI+: How to navigate the lattice of visual calculations: This video explains how to navigate the lattice of visual calculations in DAX, using COLLAPSEALL and EXPAND to move between levels. A key topic is… Read more
-
Alberto and I recorded an unplugged session to talk about the new edition of the Mastering DAX Video Course. You can watch it above, but if you prefer a quick read, here are some thoughts. The question we heard the… Read more
-
This article describes the different roles of user-defined functions and calculation groups, explaining when to use either, and how they complement each other in the design of a semantic model. Read more