my $row1 = fetch_count($dbh, "table_one");
my $row2 = fetch_count($dbh, "table_two");

print "$row1, $row2\n";

sub fetch_count {
    my $dbh = shift;
    my $table = shift;

    my $sth = $dbh->prepare("select count(*) from $table");
    $sth->execute;
    my $row = $sth->fetch_arrayref;
    return $row->[0];
}