my @array_num = qw/123 456 345 459 234/;

##</code><code>##

my $n1 = $array_num[0];
my $n2 = $array_num[1];

##</code><code>##

my @array_num = qw/123 456 345 459 234/;
my $n1        = $array_num[0];
my $n2        = $array_num[1];

my $sql= "
  SELECT tb.num1, tb.num2 
  FROM   MYTABLE tb 
  WHERE  tb.num1 = ?
  AND    tb.num2 = ?";

$sql->execute($n1, $n2);