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

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

This article describes how to compute visual totals accurately, in case a measure does not provide the right result at the total level but works correctly in other rows of the report.  Read more

This article describes how to control format strings in calculation groups. Before starting, we suggest you read the previous articles in this series.  Read more

UPDATE 2020-03-28: Calculation groups are coming soon to Power BI Desktop, read the added section at the bottom of the post. I am glad to announce that we just released an additional module about Calculation Groups to the Mastering DAX…  Read more

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

This article describes projection functions and techniques in DAX, showing the differences between SELECTCOLUMNS, ADDCOLUMNS, and SUMMARIZE.  Read more

This article describes how to implement currency conversion for reporting purposes in Power BI.  Read more

This article describes the types of relationships available in Power BI and Analysis Services, clarifying the differences in cardinality and filter propagation of physical relationships.  Read more

This article explains the behavior of LASTNONBLANK, LASTNONBLANKVALUE, and similar DAX functions, also providing patterns for performance optimization.  Read more