A filter argument in CALCULATE is always an iterator. Finding the right granularity for it is important to control the result and the performance. This article describes the options available to create complex filters in DAX. » Read more

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Limitations are placed on DAX expressions allowed in measures and calculated columns. The state below shows the DirectQuery compatibility of the DAX function.

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Use RELATED to access a column in a related table in a FILTER iterator. However, the usage of CALCULATE is preferred over FILTER, when possible.

The WHERE condition of an SQL statement has two counterparts in DAX: FILTER and CALCULATETABLE. In this article we explore the differences between them, providing a few best practices in their use. » Read more

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This article describes a number of techniques available to filter tables in DAX, showing possible pitfalls that you can avoid once you know them, in particular using bidirectional filters. One of the hardest things to do, when learning DAX, is to get rid of common sense reasoning and learn to follow a new set of […] » Read more

This article describes how to use a measure to filter a Power BI visualization, and the different behaviors of a same filter between different visuals. » Read more

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One of the few golden rules in DAX is to always filter columns and never filter tables with CALCULATE. This article explains the rationale behind the rule. » Read more

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CALCULATE is the most powerful and complex function in DAX. In this article, we provide an introduction to CALCULATE, its behavior, and how to use it. » Read more

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This article explains how the context transition interacts with the filter arguments of a CALCULATE function in DAX. This is important in order to avoid unexpected results with complex calculations made in filter arguments. » Read more

FILTER can filter rows from a table by using any expression valid in the row context. Thanks to context transition, using a measure in the filter expression it is possible to filter a table based on a dynamic calculation involving other rows and/or tables.

A common best practice is to use CALCULATETABLE instead of FILTER for performance reasons. This article explores the reasons why and explains when FILTER might be better than CALCULATETABLE. » Read more

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Understanding the difference between row context and filter context is the first and most important concept to learn to use DAX correctly. This article introduces the row context, and is part of a series of articles about evaluation contexts in DAX. » Read more