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The COALESCE function in DAX

COALESCE is a DAX function introduced in March 2020. This article describes the purpose of COALESCE and how to simplify DAX expressions by removing verbose conditions, and yet obtain the same result.  Read more

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Working below a DAX formula’s granularity

This article explains how to control the result provided by a formula in a DAX measure when the meas-ure is being used in a report with granularity below the granularity supported by the formula.  Read more

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Avoiding Pitfalls in Calculation Groups Precedence

This article describes in which conditions the precedence of calculation groups might return unexpected results when filtering calculation items in both the visuals and the measures present in a report.  Read more

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Distinguishing HASONEVALUE from ISINSCOPE

This article describes the differences between HASONEVALUE and ISINSCOPE, which are two useful DAX functions to control the filters and the grouping that are active in a report.  Read more

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Fields parameters in Power BI

This article analyzes the fields parameters feature in Power BI, unveiling some of the internals of its implementation.  Read more

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Reading active Power BI security roles in DAX

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

With the modern editors that have automatic code formatting features, each one has its own code formatting style. Usually, there are a few “common rules” for code formatting depending on the language, but there was nothing for DAX  Read more

A common best practice is to use CALCULATETABLE instead of FILTER for performance reasons. This article explores the reasons why and explains when FILTER might be better than CALCULATETABLE.  Read more

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Transition Matrix Using Calculated Tables

In the 2015 September update, Power BI introduced calculated tables, which are computed using DAX expressions instead of being loaded from a data source. This article shows the usage of calculated tables to solve the pattern of transition matrix for…  Read more

In this article, Alberto Ferrari describes a new efficient way to compute returning customers in DAX thanks to an idea suggested by a student attending an Optimizing DAX workshop.  Read more