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 BIMaster core DAX concepts, including calculated columns, measures, and error handlingUnderstand evaluation contexts and the CALCULATE and CALCULATETABLE functionsPerform time-based calculations: YTD, MTD, previous year, working days, and moreWork with expanded tables, complex functions, and elaborate DAX expressionsPerform calculations over hierarchies, including parent/child hierarchiesUse DAX to express diverse and unusual relationshipsMeasure DAX query performance with SQL Server Profiler and DAX Studio