i ask, i can use join :SELECT * FROM autori
INNER JOIN libri
ON aut_id = lib_autore ,
ask i can select a value of table libri and use in table autori?
Yes, you can use it. But if is for an application, you can not update directly it value to libri. You must use an event for that.
If you need to update both tables in the same record… create an editable view.
Regards