This article describes how to read the active security roles in a Tabular model for Power BI or Analysis Services. This way, you can use measures and calculation groups to customize a report based dynamically on security roles active for…  Read more

This article describes how to apply dynamic security roles in a hierarchical organization to minimize the maintenance effort on the security configuration and obtain the best performance at query time.  Read more

Both GROUPBY and SUMMARIZE are useful functions to group by columns. However, they differ in both performance and functionalities. Knowing the details lets developers choose the right function for their specific scenario.  Read more

This article describes how to implement the comparison between school terms. The same technique can be applied to any arbitrary time periods that do not match regular months or quarters in a calendar, such as seasons or campaigns.  Read more

When a slicer contains many items, developers can filter the most relevant items using another slicer. The scenario is easily solved with a many-to-many relationship if the source is a regular table. Still, it requires some DAX coding if the…  Read more

RANK is a new DAX function to rank items based on multiple columns. This article introduces the RANK function and its differences with RANKX.  Read more

The LINESTX DAX function simplifies the calculation of linear regressions. This article explains the correct way to manage its results efficiently.  Read more

This article describes how to use the Group By Columns property to store the slicer selection by using the same column used in a SWITCH function to optimize the query performance.  Read more

This article describes how to optimize a text search operation in DAX. This technique can improve the performance of Power BI reports that use the contains condition in the filter pane or the filter mode of the Smart Filter Pro…  Read more

The second edition of the Optimizing DAX video course is available: new content, a new book, and some on the behind-the-scenes of the project.  Read more