Set analysis in QlikView means creating sets or groups from the data using aggregate functions like Sum, Max, Min, Avg, and Count. We are not rewriting the previous data but creating new data by making sets in this set analysis.
For example, if we want to find the total sales from the India location
sum({1<Location = {India}>}Sales)
It returns wherever the location is India returns the sum of sales.
If you are interested to learn QlikView, you can enroll in this course on QlikView Training by Intellipaat.
You can watch this video on QlikView Tutorial to know more about the dashboard: