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Using ALLSELECTED with no arguments in a remote model later used in a composite model might produce unexpected results. In this article we examine the topic and provide the reasons why ALLSELECTED requires special attention. Read more
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When used in a composite model, calculation groups show a very unique behavior that a good DAX developer must understand well to build sound models. In this article we describe how composite models and calculation groups work together. Read more
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In composite models, any query can be executed on the remote model (wholesale execution) or by mixing local and remote engines together (retail execution). This article describes the differences between the wholesale and retail modes, along with examples. Read more
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Having read this question on the mdsn blogs, I investigated on the KEEPFILTERS function and, after having learned it, it is now time to write about it. Moreover, before start to write about it, I need to thank the dev team… Read more
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There are two options to model many-to-many relationships using Tabular and Power BI: you can use either a regular bidirectional filter relationship, or a limited unidirectional relationship. In this article, we compare the performance of both options. Read more
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In this article we perform a performance comparison between header/detail models and star schemas. Building a star schema might require a few ETL steps and some coding. Nonetheless, it is always the best modeling option. Read more
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In DAX, optimizations and data types do not always play nice and can leave you dealing with surprises. In this short article, we see an example of how mixing blanks, Boolean logic, and comparison with TRUE might lead to unexpected… Read more
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When you use a measure as a filter in a Power BI visual, the DAX code generated might display different behaviors depending on whether the measure is part of the values shown in the visual or not. In this article,… Read more
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Tabular models (including Power BI) require marking the Date table as a date table to get appropriate results with time intelligence calculations. This article explains why this setting is required. Read more
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ALLEXCEPT is a handy DAX function to retrieve all the columns of a table except for some. When used as a CALCULATE modifier, its behavior is less intuitive and might result in inaccurate measures. In this article, we elaborate on… Read more