Marco Russo's blog posts of 2018

16 blog posts
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DAX Guide – the reference I had been wanting

If you have read the book Alberto and I wrote, “The Definitive Guide to DAX” then by looking at the title you might think that this post is about the book. Not this time. I am talking about the new…  Read more

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DAX Studio and Power BI diagnostic port

DAX Studio connects to a Power BI Desktop model using a technique that was not officially supported until a few months ago. This changed when the “diagnostic port” was documented in this article of the official documentation:  Read more

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Dates differences between Excel and DAX

DAX supports dates starting in 1900 and while teaching DAX I always explain that DAX manages dates like Excel, which is the reason why these limitations exist. Actually, this is true – but answering to a comment today I realized…  Read more

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The hidden secrets of TOTALYTD

DAX has many time intelligence functions that are often redundant, offering different shorter syntaxes for longer more generic functions. However, sometimes the shorter syntax could be dangerous, as I explain in this blog post where I suggest using CALCULATE and…  Read more

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Smart Filter Pro Preview

Today we start the preview of Smart Filter Pro. This is the first commercial custom visual produced by OKViz and it will be in preview until the end of 2018. You can start using it today, no registration required, and…  Read more

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Correct calculate of age in DAX from birthday

By answering to a student question I realized we often used a wrong calculation of customers age in DAX, and the simple solution is to borrow the same technique used in Excel, using INT and YEARFRAC rather than DATEDIFF or…  Read more

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How to write DISTINCTCOUNTX in DAX

I received a question about how to implement the equivalent of a DISTINCTCOUNTX function in DAX. Well, such a function doesn’t exist in DAX, but imagine you want to write something like: The corresponding measure working in DAX is: In…  Read more