Today I prepared a table of the many rounding functions available in DAX (yes, it’s part of the book we’re writing), so that I have a complete schema of the better function to use, depending on the round operation I need to do. Here is the list of functions  Read more

I just read the Dave Wickert post about his sessions about PowerPivot from Microsoft at TechEd 2010 in New Orleans (June 7-10, 2010) and there are at least two things I’d like to add. First of all, there is also another conference! In fact, this time  Read more

As you might already know, I and Alberto Ferrari are writing a book about PowerPivot 2010 for Excel. The official title is Microsoft PowerPivot for Excel 2010: Give Your Data Meaning and you can already order it on Amazon ! However, it will be published  Read more

If you use PowerPivot and write some DAX formula, don't miss this post on PowerPivotPro blog - if you want to get an external editor for your DAX formula, you can use Notepad++ for free - and adding the customization described in this post by Colin Banfield,  Read more

When you use CALCULATE in DAX you are creating a new filter context for the calculation, based on the existing one. There are a few functions that are used to clear or preserve a column filter. These functions are: ALL – it can be used with one or more  Read more

UPDATE 2017-07-12: please note this article was written in 2010, there are now better ways to obtain the same result. Please read these articles: Physical and Virtual Relationships in DAX and Propagate filters using TREATAS in DAX PowerPivot supports  Read more

A calculated column is a DAX expression which is evaluated when the PowerPivot workbook is updated. It is very useful, but there are cases where you want to delay calculation at query time. For example: You want to make part of the calculation depending  Read more

I recently talked about memory usage in PowerPivot and previously I wrote about difference modeling options using table normalization or not . Thus, I wondered whether table normalization is a good practice for performance and memory or not. The short  Read more

Denny Lee described how to open a trace file in PowerPivot for Excel . It is something that is very important because the SSAS engine which runs PowerPivot runs inside the Excel process and doesn’t have an external connection (thus, also SQL Profiler  Read more

PowerPivot for Excel is an Add-In which uses a local version of Analysis Services (SSAS) to process data and make calculation to respond to user queries made using Excel 2010. The SSAS engine is loaded in-memory in the process of Excel. Especially with  Read more