title: The Definitive Guide to DAX: Business intelligence with Microsoft Excel, SQL Server Analysis Services, and Power BI (Business Skills)
author:  Alberto Ferrari 
description: <b>Marco Russo</b> and <b>Alberto Ferrari</b> cofoundedsqlbi.com, where they regularly publish articles about Microsoft PowerPivot, DAX, Power BI, and SQL Server Analysis Services. They also speak regularly at major international conferences, such as TechEd, Ignite, PASS Summit, and SQLBits. Both consult and mentor on business intelligence (BI) and Microsoft BI technologies, having worked with them since 1999. Their books include<i>Microsoft Excel 2013 Building Data Models with PowerPivot</i>, <i>Microsoft SQL Server 2012 Analysis Services: The BISM Tabular Model</i>,and <i>Microsoft PowerPivot for Excel 2010: Give Your Data Meaning</i>.
zlib_text: Data Analysis Expressions (DAX) 
  Reference 
  SQL Server 2012 Books Online 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
  Summary: The Data Analysis Expressions (DAX) language is a library of functions and 
  operators that can be combined to build formulas and expressions. 
  Category: Reference 
  Applies to: SQL Server 2012 
  Source: SQL Server Books Online (link to source content) 
  E-book publication date: June 2012
  
  Copyright © 2012 by Microsoft Corporation 
  All rights reserved. No part of the contents of this book may be reproduced or transmitted in any form or by any means 
  without the written permission of the publisher. 
   
   
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  http://www.microsoft.com/about/legal/en/us/IntellectualProperty/Trademarks/EN-US.aspx are trademarks of the 
  Microsoft group of companies. All other marks are property of their respective owners. 
   
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  depicted herein are fi