August 2019
Intermediate to advanced
768 pages
26h
English
book
Definitive Guide to DAX, The: Business intelligence for Microsoft Power BI, SQL Server Analysis Services, and Excel, 2nd Edition
by Alberto Ferrari, Marco Russo
Content preview from Definitive Guide to DAX, The: Business intelligence for Microsoft Power BI, SQL Server Analysis Services, and Excel, 2nd Edition
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Chapter 7Working with iterators and with CALCULATE
In previous chapters we provided the theoretical foundations of DAX: row context, filter context, and context transition. These are the pillars any DAX expression is built on. We already introduced iterators, and we used them in many different formulas. However, the real power of iterators starts to show when they are being used in conjunction with evaluation contexts and context transition.
In this chapter we take iterators to the next level, by describing the most common uses of iterators and by introducing many new iterators. Learning how to leverage iterators in your code is an important skill to acquire. Indeed, using iterators and context transition together is a feature that is unique ...
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