Isolating and Documenting DAX Expressions
Isolating expressions into independent and interchangeable DAX measures or as variables within measures is recommended to simplify development and ownership of the dataset. Independent measures can be hidden from the Fields list yet contain core business definitions and efficient filtering logic to drive the results and performance of many other measures in the model. Although scoped to each measure, DAX variables provide a self-documenting coding style and, unlike scalar-valued measures, also support table values thus allowing for even greater modularity.
In this recipe, DAX variables, measures, and comments are used in different examples that demonstrate best practices around the creation and use of DAX expressions.
Getting ready
To prepare for this recipe, follow these steps:
- Open a Power BI Desktop file locally and access the Power Query Editor by clicking on Transform Data in the ribbon of the Home tab
- Create...
