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use DBI;

...
my $sth = $dbhX->prepare("SELECT * FROM reg501");
$sth->execute();
$dbhA->do("CREATE TABLE etstx AS SELECT * FROM ?",{}, $sth);

SQL ERROR: Bad table or column name '?' has chars not alphanumeric or 
+underscore!

...

Can't call method "execute" on an undefined value at C:/Perl/site/lib/
+SQL/Statement.pm line 254.
 [for Statement "SELECT * FROM ?"] at testdbf.pl line 8.