DAX Function Guide

The purpose of this function is to remove the corresponding filter from the filter context and to make calculations on all the rows within a table. 

The argument to the ALL function must be either a reference to a base table or a base column. Table expressions or column expressions cannot be used with the ALL function. 

The ALL function cannot be used by itself. Instead, it is utilized as an intermediate function to change the results where some other calculation is being performed. For example, you can use ALL to remove all filters everywhere, to remove all filters from a specified table, or to remove all filters from specified columns in a table.