Ferrari A., Russo M. The Definitive Guide to DAX: Business intelligence with Microsoft Excel, SQL Server Analysis Services, and Power BI

Microsoft Press, 2015. — 592 p. — ISBN: 978-0735698352.This comprehensive and authoritative guide will teach you the DAX language for business intelligence, data modeling, and analytics. Leading Microsoft BI consultants Marco Russo and Alberto Ferrari help you master everything from table functions through advanced code and model optimization. You’ll learn exactly what happens under the hood when you run a DAX expression, how DAX behaves differently from other languages, and how to use this knowledge to write fast, robust code. If you want to leverage all of DAX’s remarkable power and flexibility, this no-compromise “deep dive” is exactly what you need.Perform powerful data analysis with DAX for Microsoft SQL Server Analysis Services, Excel, and Power BI
Master core DAX concepts, including calculated columns, measures, and error handling
Understand evaluation contexts and the CALCULATE and CALCULATETABLE functions
Perform time-based calculations: YTD, MTD, previous year, working days, and more
Work with expanded tables, complex functions, and elaborate DAX expressions
Perform calculations over hierarchies, including parent/child hierarchies
Use DAX to express diverse and unusual relationships
Measure DAX query performance with SQL Server Profiler and DAX Studio