I think it would help to understand the different outputs you get from the two different options.
This thread might be a good read
hope that helps
Thank you for your answer. I do understand that with a keep, there will still be 2 separate tables but what is better? To have only one "big" table or to keep separates tables ? How to choose ?
I haven't deeply checked but I don't think there are any differences in the 2 outputs I get with the 2 options. I am just wondering if one is better in term of performance and speed of the execution.