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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
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This article describes the semantic difference between ALLEXCEPT and the joint use of ALL and VALUES, showing practical examples of the different results in Power BI and SSAS 2016. Read more
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This article shows how to use calculation groups to define a default set of values for columns in your model. Different users can have different default values, and yet retain the full capability to select different values. Read more
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This article describes how blank values considered in a DAX conditional expression can affect its query plan and how to apply possible optimizations to improve performance in these cases. Read more
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In this article we show various techniques to force a measure to return zero instead of blank, in order to highlight combinations of attributes with no data. Read more
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SUMMARIZE is a very powerful and very complex function to use. This article describes its internal behavior, and provides guidance on how to use it. Read more