Values such as inventory and balance account, usually calculated from a snapshot table, require the use of semi-additive measures. In Multidimensional you have specific aggregation types, like LastChild and LastNonEmpty. In PowerPivot and Tabular you use DAX, which is flexible…  Read more

In a Power Pivot or Tabular model with inactive relationships, one can rely on the USERELATIONSHIP function to apply an inactive relationship to a particular DAX expression. Its usage is simple in a measure, but one might consider alternative syntax…  Read more

In the traditional star schema design of a Data Mart, you replace a missing, unknown or wrong date in the fact table with a dummy value in the Date dimension table. In Tabular, handling a Date table requires an existing…  Read more

With DAX you can calculate the sales of the first, second and third year of a new customer without any ETL. In this article you see how to implement this calculation with good performance.  Read more

You can implement the calculation of stock inventory over time in several ways in DAX. The xVelocity technology in Power Pivot and Analysis Services Tabular is so fast that you might considerboth dynamic calculation and snapshot based calculation  Read more

When you create a Tabular model in Microsoft SQL Server Analysis Services (SSAS), you have to define all of the measures that the user will be able to use. All the measures defined in the measure grid of a table…  Read more

Grouping transactions by customers’ age requires a computation made row by row at transaction level. DAX offers an elegant solution using calculated columns, which is described in this article.  Read more

This article contains a short checklist of what you have to do in order to optimize the memory used by a data model in PowerPivot or in Analysis Services Tabular, including links to tools and resources that can help you…  Read more

The DAX language provides several Time Intelligence functions that simplify writing calculations such as year-to-date (YTD), year-over-year (YOY) and so on. However, if you have a special calendar structure such as a 4-4-5 weeks’ calendar, you need to write your…  Read more

When you use Excel to connect to a Tabular database in Analysis Services, you get a PivotTable as a result. In this article, you learn how to import data in a table writing a DAX query than runs on Analysis…  Read more