Last week I migrated Sharepoint database from a server to another one. I did not have any problem with restore database on new server but the problem started when I tried to add the new content database to sharepoint. I had this error:
This content database has a schema version which is not supported in this farm.
After some check and some scounting on Google, I found the reason: The version of Sharepoint where I get the database is different from the version where I tried to install it. In my case the problem was that on the destination server the Sharepoint Service pack 1 was missing. After installation of Service pack I could add the new content database.
To check the build version, I open the “Manage Patch Status” from Sharepoint Central Administrator: