Please clarify "export"? Do you want to "migrate"? (If so, then you should be able to do backup / restore)
Yes, I would like to migrate the finished nopcommerce site to sql 2016. I've searched and tried a lot of stuff but It can't do the job. What do I need to do?
If the DB is local, use a tool like SSMS to backup & restore. If your site is hosted, then the hosting control panel should have similar backup / restore.