Select Code to Download

$sql = "SELECT field_1, field_2 FROM myTable";
$sth = $dbh->prepare($sql) or die("Could not prepare!" . $dbh->errstr)
+;
...
   print "myhash{$val_1} = $myhash{$val_1}\n";
}

if ($val_2) {
   $myhash{$val_1} = $val_2;
...
else {
   $myhash{$val_1} = '';
}