Topic: DAX
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I recently wrote an article about duplicated names in DAX to highlight a possible case where you can have a measure with the same name of a column. This is not a good idea, mainly because the syntax to reference a measure and a column is identical, and Read more
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One of the side effects that you might not expect from a table filter in a CALCULATE statement is the removal of an existing filter. In reality, this is a condition that happens when you write an explicit CALCULATE in a row context, because the table Read more
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I recently wrote an article to described in more details the syntax of the IN operator in DAX , which is available in Power BI and in the CTP of the next release of Analysis Services. Jeffrey Wang wrote a blog post about the IN operator a few months ago, Read more
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One year ago I wrote an article describing how the time intelligence DAX functions work in Power BI (I just updated the article including the example described below). In a recent event in Sydney I observed a strange (or at least unexpected) behavior Read more
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One of the latest addition to DAX has been the ability to apply an external filter context to SUMMARIZECOLUMNS, which makes this function a perfect replacement for SUMMARIZE in DAX. In The Definitive Guide to DAX I introduced such a function, but at the Read more
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When you use the time intelligence functions in DAX, it is relatively easy to filter the same dates selection in the previous year by using the SAMEPERIODLASTYEAR or DATEADD functions. However, if you follow the best practices, it is likely that you have Read more
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If you work with Power Pivot, Power BI, or Analysis Services Tabular, you probably already know VertiPaq Analyzer. If you never used it, with the new release 1.7 you have another couple of very good reason to try it. VertiPaq Analyzer is a Power Pivot Read more
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If you think that the end of the year would have been a quiet time because the Power BI team will skip their monthly release (but are we sure?), you might be reassured (or disappointed depending on your perspective) looking at the news I have in this Read more
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If you want to format a measure as date in Power BI, you need an expression returning a date/time data type. This is different from what you can do in Power Pivot and in SSAS Tabular, where you can format any numeric expression using a date and/or time Read more
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The SQL Server Data Tools (SSDT) editor for Tabular models has been improved in the recent updates. For example, the Tabular Model Explorer enables you to quickly jump between the entities of your model organized in a hierarchical way. However, when it Read more