yes, you can run regular sql queries on your database where you can join/group tables.

if you want to join/group static files (like csv/excel), then you'd need import your files into dropbase DB first and then run sql query on that DB.

let me know if this answered your questions.

no, it didn't. you should add a feature where you have 2,3,4,5 tables represented as CSV and you can do joins on them