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Microsoft SQL Server 2014 Business Intelligence Development Beginner's Guide

You're reading from   Microsoft SQL Server 2014 Business Intelligence Development Beginner's Guide Get to grips with Microsoft Business Intelligence and Data Warehousing technologies using this practical guide

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Product type Paperback
Published in May 2014
Publisher
ISBN-13 9781849688888
Length 350 pages
Edition Edition
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Authors (2):
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Reza Rad Reza Rad
Author Profile Icon Reza Rad
Reza Rad
Abolfazl Radgoudarzi Abolfazl Radgoudarzi
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Abolfazl Radgoudarzi
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Table of Contents (19) Chapters Close

Microsoft SQL Server 2014 Business Intelligence Development Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Data Warehouse Design 2. SQL Server Analysis Services Multidimensional Cube Development FREE CHAPTER 3. Tabular Model Development of SQL Server Analysis Services 4. ETL with Integration Services 5. Master Data Management 6. Data Quality and Data Cleansing 7. Data Mining – Descriptive Models in SSAS 8. Identifying Data Patterns – Predictive Models in SSAS 9. Reporting Services 10. Dashboard Design 11. Power BI 12. Integrating Reports in Applications Index

Data Analysis eXpression, calculated columns, and measures


Data Analysis eXpression (DAX) is a query language for tabular models of Microsoft, such as PowerPivot and SSAS Tabular. DAX was introduced in 2010 with PowerPivot and enhanced in SSAS Tabular 2012. The structure of a DAX command is very simple, but a number of built-in functions in DAX is enough to create complex expressions to answer business requirements.

DAX is the language used for creating calculated columns and measures. As you saw in the previous sections, calculated columns are columns added in each table. The value of the calculated columns will be calculated at the time of processing and will be stored in memory. Measures also use DAX expressions for calculations. Measures will be calculated on the fly; their value won't be stored anywhere and will just be visible to the user after calculation. There are two main kinds of evaluation contexts in DAX: row context and filter context. Row context means the current row and...

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