> some of the tables after the import became completely empty, even the old values have been deleted, instead of getting filled up.
I've no idea what that means.
> How I can import the content of the sql tables?
By running the dumpfile of course.
> If I delete a table before import, it will be re-created during the import, but no values will be imported (although the values are available in the sql file).
Then MySQL must be issuing error messages.
>It is strange that if there is no table, and the table is created, I get following error message:
> Incorrect string value: '\xC3\xA1s Es...' for column 'UserNa
me' at row 201
That looks like a charset/collation problem. You might find help on that at
http://mysql.rjweb.org/doc.php/charcoll
> Is it maybe a character set problem? In the source database I have Hungarian characters. In some cases I specified it as UTF8, in some cases as latin2. Which set is the "correct"?
As above.
> Where can I set the character set for a non-existing table?
I've no idea what that means.