How to display the differences between data?

I'm so sorry to bother the group. I've got two data sets ("all the data", and "processed data"). I'm trying to build a report in the editor where I can take the "processed data" away from "all the data" so that I can see what has yet to be processed. I'm pretty sure its possible, I'm just rusty. Can someone give me a kick please?

Hi @paintbb84
If you need something more advanced, then you probably need to do it in SQL.
When you join the two tables, then you would filter a column on "processed" that is empty