i need small help , i am caluclating the YOY growth in stright table so i have a list box with values like 2017Q1 to 2018Q3 so the expression which i used is working fine with single selection but when i tried to select multiple values the result is showing null ... how to avoid this ? below is my expresion
With information that you have provided its pretty hard to give informed advice.
I recommend that you upload a small sample with the table, your variables and expressions and sufficient data to populate the table. It does not have to be real data, but it must contain the structure.
As always with expressions with nested variables, its best to try and get the expression to work with out the variables first and then replace parts of the expression with the variables one a a time. That way your are solving a single problem and you have a working table as a starting point.