allow you to perform calculations across a set of table rows that are related to the current row (as Windows functions)

What is the problem or goal the end user is trying to solve or accomplish?

He needs to perform calculations perform calculations across a set of table rows that are related to a current row

How are they solving it currently?

Creating Windows functions directly on the database to interrelate the rows and create a dataset with the resulting query

What is the recommended solution by the Customer?

Create a UI feature for Mixed Chart that lets you perform calculations across a set of table rows that are related to a current row.