Topic: Power BI

       Page 7 of 81 articles
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Compare equivalent periods in DAX

If you do not have a full month with data, comparisons such as year-over-year (YOY) might require particular filters in order to do a like for like comparison in DAX. This article describes how to write DAX expressions comparing equivalent…  Read more

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Use of RANKX in Power BI measures

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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Analyzing events with a duration in DAX

This article analyzes how to efficiently work with events that lasts over time, such as the duration of an order considering the distance between order date and ship date.  Read more

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Using ALLEXCEPT versus ALL and VALUES

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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Physical and Virtual Relationships in DAX

DAX calculations can leverage relationships present in the data model, but you can obtain the same result without physical relationships, applying equivalent filters using specific DAX patterns. This article show a more efficient technique to apply virtual relationships in DAX…  Read more

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Optimizing DAX expressions involving multiple measures

Writing measures referencing other measures is in general a good idea that simplifies the DAX code, but you might face specific bottlenecks. This article describes which performance issues might arise when different measures aggregate the same column using different filter…  Read more

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Many-to-many relationships in Power BI and Excel 2016

The new DAX available in Excel 2016 and the data model in Power BI and Analysis Services 2016 offer tools to manage many-to-many relationships in a more efficient way than previous version, as described in this article.  Read more