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Understanding numeric data type conversions in DAX
This article describes how DAX automatically converts data types in arithmetic operations. These small details can cause and explain differences in results when using the same operations in other...
View ArticleWhat has happened in the DAX world in 2018
We are approaching the end of 2018, so it is a good time to review what happened in the DAX world this year, what we’ve been up to at SQLBI and what is going to happen in 2019. New DAX functions in...
View ArticleCalculation Groups in DAX – first impressions
Microsoft announced at SqlBits a very important feature for DAX: Calculation Groups. These are my first impression about the new feature and the impact it will have on Analysis Services and Power BI....
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Semi-Additive Measures in DAX
Values such as inventory and account balance, usually calculated from a snapshot table, require the use of semi-additive measures. This article describes how to implement these calculations in DAX...
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Understanding relationships in Power BI
Relationships are the foundation of any Power BI or Analysis Services Tabular data model with multiple entities. At first sight, this is a trivial concept, especially if one has a knowledge of...
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Different types of many-to-many relationships in Power BI
The introduction of the weak relationships in Power BI composite models enables new data modeling techniques. However, not all of the many-to-many relationships can be managed by using weak...
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The Definitive Guide to DAX second edition now available worldwide
The second edition of The Definitive Guide to DAX is now available worldwide! This blog post explains why we felt the need to rewrite the book and describes what happens behind the scenes when...
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VertiPaq Analyzer 2.0 Preview 1
In 2015 I released the first version of VertiPaq Analyzer, a tool to quickly analyze the structure and data distribution of a Tabular model that can be used with Analysis Services and Power BI. During...
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Strong and weak relationships in Power BI
This article describes what weak relationships are and the differences between strong and weak relationship in Power BI and DAX. Weak relationships have been introduced in Power BI with composite...
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Comparing DAX calculated columns with Power Query computed columns
This article provides information to help choose between DAX and Power Query when a table needs to compute additional columns. When building a data model in Power BI, Analysis Services, or Power Pivot,...
View ArticleChoosing Azure Analysis Services for large datasets
I often get questions about use cases for Azure Analysis Services. So I wanted to do a quick recap of the points I commonly discuss in these conversations, and have them readily available for the next...
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Optimizing conditions involving blank values in DAX
This article describes how blank values considered in a DAX conditional expression can affect its query plan and how to apply possible optimizations to improve performance in these cases. An important...
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Understanding eager vs. strict evaluation in DAX
This article describes the differences between eager evaluation and strict evaluation in DAX, empowering you to choose the best evaluation type for your data models. A conditional expression in DAX –...
View ArticleUpdating tabular models for Ordinal property in calculation groups
If you created a Tabular model using one of the preview versions (CTP, RC, …) of Analysis Services 2019, you don’t have the final structure for the Ordinal attribute that Microsoft defined in the final...
View ArticleWhat has happened in the DAX world in 2019
Another year has gone by and it has now been 10 years since DAX was first introduced in late 2009. As usual, it is time to review the past year and to take a look at the year ahead. New DAX functions...
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Why reports obtained with Analyze in Excel can be slower
This article describes the reasons why an Excel pivot table may be slow when using the Analyze in Excel feature of Power BI. Power BI uses the Analysis Services Tabular engine to process queries coming...
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Relationships in Power BI and Tabular models
This article describes the types of relationships available in Power BI and Analysis Services, clarifying the differences in cardinality and filter propagation of physical relationships. Power BI and...
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Currency conversion in Power BI reports
This article describes how to implement currency conversion for reporting purposes in Power BI. Currency conversion applied to reporting can include many different scenarios. Data in multiple...
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Avoiding Pitfalls in Calculation Groups Precedence
This article describes in which conditions the precedence of calculation groups might return unexpected results when filtering calculation items in both the visuals and the measures present in a...
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Using USERELATIONSHIP in DAX
This article shows how to use the USERELATIONSHIP function in DAX to change the active relationship in a CALCULATE function. If two tables are linked by more than one relationship, you can decide which...
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