Creating a star schema in Power BI is the best practice to improve performance and more importantly, to ensure accurate results! This article shows why a star schema can fix some of the issues in your report.  Read more

This article provides information to help choose between DAX and Power Query when a table needs to compute additional columns.  Read more

This article describes how to analyze the performance of a DAX measure based on a DISTINCTCOUNT calculation and how to evaluate possible optimizations.  Read more

This article shows how to add an additional “other” row to the selection obtained using the Top N filter in a Power BI report.  Read more

This article describes a naming convention for temporary columns in DAX expressions to avoid ambiguity with the measure reference notation.  Read more

This article describes what weak relationships are and the differences between strong and weak relationship in Power BI and DAX.  Read more

This article describes how to compute previous year values up to a certain date. This is useful in case the data is presenting incomplete months or years.  Read more

This article describes how to create a slicer showing the values of multiple columns, applying the filter on any of the underlying columns.  Read more

There are two functions in DAX that return the list of values of a column: VALUES and DISTINCT. This article describes the difference between the two, explaining the details of the blank row added to tables for invalid relationships.  Read more

The second edition of The Definitive Guide to DAX is now available worldwide! This blog post explains why we felt the need to rewrite the book and describes what happens behind the scenes when producing a book.  Read more