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  • User group session in Amsterdam on Nov 26, 2016: Toolkit for #dax optimization

    While I am teaching Mastering DAX and Optimizing DAX classes, I am always available to speech at local user group events. This week, I will present an updated version of the “Toolkit for DAX Optimization” in Amsterdam, on Thursday, November 26, 2016. At this link you can register (for free) and see logistics details (user group event is ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on November 23, 2015
  • Apply AND instead of OR logic to multiple selection in a slicer #dax #powerpivot #powerbi

    I recently write a small article on SQLBI to describe how to create a DAX measure that search for items that have all the items selected in a slicer, instead of any of them. For example, you might want to create a measure that display how many customers bought at least one product for each of the categories selected in a slicer. You cannot ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on November 17, 2015
  • Challenge your #dax skills with DAX Puzzle #powerbi #powerpivot

    Last week we launched a new page in SQLBI website: DAX Puzzle (you can also use The idea is very simple: we describe a scenario, we ask to solve a problem in that scenario and we might provide some hint to help you finding the solution. You can download a sample file (in Power BI Desktop, which is freely available to anyone – ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 21, 2015
  • The Definitive Guide to DAX is now available! #dax #powerpivot #powerbi #ssas #tabular

    I am so happy to announce that The Definitive Guide to DAX is finally available! I and Alberto Ferrari spent one year writing this book, and several years collecting the knowledge necessary to do that. The complete title is The Definitive Guide to DAX: Business intelligence with Microsoft Excel, SQL Server Analysis Services, and Power BI. You can ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on October 20, 2015
  • Fix performance issue of pivot tables with Tabular models

    If you use SSAS Tabular, this is a very important news! Microsoft released a very important update for Analysis Services 2012 that provides performance improvements to pivot tables connected to an Analysis Services Tabular model: it is SQL Server 2012 SP2 Cumulative Update 8. Microsoft discussed some of these improvements in this blog post: ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on September 22, 2015
  • Don’t ignore the Context Transition in #dax

    Almost 3 years ago I wrote an article with the rules for DAX code formatting. If you quickly look at the article, you might think that it is all about readability of the code, and this is fundamentally true. But there two rules that have a particular importance for performance, too: Never use table names for measures Always use table names ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on September 22, 2015
  • Back to the basic: #dax primers for new #powerbi users

    The growing adoption of Power BI Desktop is gathering new users of the DAX language. At the same time, there are a few new features, such as bidirectional filter propagation, that introduce new concepts to existing knowledge. For this reason, in the last weeks we published two articles describing important basic concepts and clarifying the ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on September 7, 2015
  • Power BI Desktop & Excel

    The August 2015 update of Power BI Desktop added two important features for existing Excel and Analysis Services users:Import Excel Power BI artifacts (Data Model, Queries, Power View) into a new Power BI Desktop fileLive Analysis Services Connections: Ability to change the database from Edit Queries dialogIn case you didn't try it before, ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on August 31, 2015
  • DAX Formatter now supports Power BI Desktop and Excel 2016 #dax #powerbi

    If you use DAX, you should try DAX Formatter. Now it supports all the new functions introduced in Power BI Desktop and in Excel 2016. There are more than 70 new functions, even if half of them corresponds to Excel functions with the same name (see the second group). DAX Formatter also supports the variable syntax available in the new DAX. These ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on August 18, 2015
  • The ALLSELECTED function under the cover #dax #tabular #powerpivot #powerbi

    I and Alberto Ferrari recently completed the writing of The Definitive Guide to DAX, and we spent months to correctly describe the internals of evaluation context in this language. There are many details that make data model working with both DAX and MDX, and sometime there are behaviors that are not intuitive to understand. A function that seems ...
    Posted to SQLBI - Marco Russo (Weblog) by sqlbi on August 5, 2015
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