Hi @SeMo,
Do you mean you want to do some kind of aggregation on the sites? If that’s the case you could just use a GroupBy node after the “infectionsites” and “nucleifiltered” and choose the ‘ImageNumber’ as group column. Then chose the type of aggregation you’d like to do in the Aggregation Tab. This way you would end up with a unique key and then just join on ‘ImageNumber’ with the “images” file to get the name of the wells into the table.
Also, if you are only interested in a specific column for one of the files you could filter out all other columns using a Column Filter node. Doing the filtering as early in the workflow as possible (hence reducing the amount of data) is always a good idea to speed up the processing.
Cheers
David