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2022 | OriginalPaper | Buchkapitel
4. Evaluation Context
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Abstract
You have learned to author simple calculated columns and measures, but one of the most fundamental questions for DAX users is how these two types of expression differ. At this stage, you understand that calculated columns are row-level calculations and that measures are calculations that are performed at the report level. However, we need to be more specific regarding this differentiation, and you need to understand that the definitive difference lies in the context in which the expressions are evaluated. In calculated columns, expressions are evaluated in the row context; in measures, they are evaluated in the filter context. It is the latter of these that will be the main focus in this chapter. Once you understand the implications of the filter context, the implications of the row context are more readily understood.