you must write it like that:
$sql = "INSERT INTO resttickets (v_name,n_name,e_mail,strasse,plz,ort,teil_alter) VALUES ('$v_name','$n_name','$e_mail','$strasse','$plz','$ort','$teil_alter')";
with no spaces inside the clamps!
and the type must be "char"
I hope i could help you.
PS: sorry my english is very bad.