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At SQLBI, Alberto Ferrari and I spend most of our time sharing our knowledge and expertise in DAX. We have been doing this for years, navigating through conferences, workshops, and videos, encountering many individuals – from eager beginners to seasoned… Read more
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This article describes the difference between the results of DATEADD and PARALLELPERIOD in DAX. These differences also impact many other time intelligence functions that are syntax sugar of these two. Read more
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This article describes the use of the tuple syntax in DAX expressions to simplify comparisons involving two or more columns. Read more
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Our end-of-the-year tradition is to recap what happened in the DAX and SQLBI world and look at what is coming next. Read more
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This article describes how to join tables in DAX when there are no relationships in the data model. The data lineage plays an essential role in this scenario. Read more
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This article describes the practical uses of NATURALLEFTOUTERJOIN and NATURALINNERJOIN in DAX. These functions are not commonly used in DAX because they do not have the same flexibility as the corresponding concepts in SQL. Read more
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The DirectQuery over SQL section of the Optimizing DAX video course is now available! In May 2023, we released the second edition of Optimizing DAX, which was completed for the first three sections: Core Concepts, Formula Engine, and VertiPaq. The… Read more
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This article describes how to correctly shape a data model and prepare data to use a Sankey Chart as a funnel, considering events related to a customer (contact, trial, subscription, renewal, and others). Read more
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Activating bidirectional cross-filter in a Tabular data model might create ambiguous paths in the chain of relationships, resulting in very dangerous models as numbers become unpredictable. This article provides a deep explanation of the kind of ambiguity that might appear… Read more
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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