I have some issues to find an appropriate data model and I would like to have some advise if it is possible.
I would like to compare two files with multiple references of products, a new and an old one.
So I have the following table :
New beginning date
New finished date
Old beginning date
Old finished date
The issue is that I have to draw a graph with dates so I created a canonical table
Old or New
But then I need the same thing with the finished date. I would need a canonical table with the beginning date and the finished date but I don't know how to do that without having two different table...
I don't think my data model is the best one and I would like to have some advise because my loading is quite long right now with the canonical table.