How to filter a dataset using a separate dataset with 1000s of IDs (subquery, scripting)
I have a "BIG" dataset containing several million rows. Each row has a specific IDENT field. IDENT may occur multiple times. I have another, smaller dataset "SMALL", that contains just hundreds of 1000s of rows. Each row has also a specific IDENT field. Now I just want to keep all the rows from BIG, that have the same IDENT in SMALL. In other words: How to filter BIG using the IDENT field from S...