In this chapter, we will look at a very specific DAX behavior, and that is how DAX treats empty, missing, and null values.1
We will be examining this behavior in the context of a calculated column and mostly creating expressions that would only be valid in this context. However, you must appreciate that the behavior of empty, missing, and null values is exactly the same in the context of DAX measures, and the examples at the end of this chapter will illustrate this.