Topic: Power BI
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Expanded tables are the core of DAX; understanding how they work is of paramount importance. This article provides a theoretical foundation of what expanded tables are, along with fundamental concepts useful when reading DAX code. Read more
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ALLSELECTED is a powerful function that can hide several traps. This article is an in-depth analysis of the behavior of ALLSELECTED, explaining shadow filter contexts, what they are and how they are used by ALLSELECTED. Read more
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This article describes how to use variables to optimize the performance of DAX expressions containing multiple instances of the same measure or the same sub-expression. Read more
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This article explains how the context transition interacts with the filter arguments of a CALCULATE function in DAX. This is important in order to avoid unexpected results with complex calculations made in filter arguments. Read more
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This article describes a counterintuitive behavior of BLANK in DAX measures affecting Power BI, Analysis Services, and Power Pivot. That behavior could cause mistakes in a report using alternate expressions of the same calculation. Indeed, these expressions are not equivalent… Read more
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This article explains how to use KEEPFILTERS to intersect instead of overriding an existing filter context in DAX, simplifying the code and improving performance. Read more
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This article describes how to create a table with a series of numbers in DAX by using the new GENERATESERIES function or through a workaround using CALENDAR. Read more
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This article describes how table expansion and filter context propagation are important DAX concepts to understand and fix small glitches in DAX expressions. Read more
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The RANKX function in Power BI might have an unexpected behavior when applied to a column that has a specific sort order in the data model. This article explains why, and how to address this issue. Read more
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This article describes how to implement non-visual-totals with security roles in Power BI and Analysis Services Tabular, which by default show only visual totals of measures in the model. Read more