my $dbh = DBI->connect("DBI:CSV:f_dir=.;csv_eol=\n;")
      or die "Cannot connect: " . $DBI::errstr;

$dbh->{'csv_tables'}->{'bt'}   = { 'file' => './X_Con.csv'};
$dbh->{'csv_tables'}->{'sec'}  = { 'file' => './Y_Con.csv'};
$dbh->{'csv_tables'}->{'stats'}  = { 'file' => './Z_Con.csv'};

my $sth_sec = $dbh->prepare("SELECT KEY, TEST, INSTANCE, ID, HID FROM sec")
        or die "Can't prepare SQL statement: $DBI::errstr\n";

my $sth_bt = $dbh->prepare("SELECT NAME, STATE FROM bt WHERE ID =? AND HID=?")
        or die "Can't prepare SQL statement: $DBI::errstr\n";

my $sth_stats = $dbh->prepare("SELECT CCS, kbps, MBytes FROM stats WHERE ID=? AND HID=? & INSTANCE=?")
        or die "Can't prepare SQL statement: $DBI::errstr\n";

$sth_sec->execute()
        or die "Can't execute SQL statement: $DBI::errstr\n";

open(TRAFFICSTATS,'>',"NoThroughput.csv") || die("Cannot Open File");
{
   my $old_sel = select(TRAFFICSTATS);
   $| = 1;  # Auto-flush.
   select($old_sel);
}

print TRAFFICSTATS "KEY,ID,HID,NAME,STATE,CCS,kbps,MBytes\n";

while ( my @row = $sth_sec->fetchrow_array ) {

  my ( $keyId,
       $testCarrier,
       $instanceId,
       $id,
       $hId ) = @row;

   $sth_bt->execute( $id, $hId );

   @row = $sth_bt->fetchrow_array;

   my ( $name, $state ) = @row;

   $sth_stats->execute($id, $hId, $instanceId );

   @row = $sth_stats->fetchrow_array;

   my ( $CCS, $kbps, $mBytes ) = @row;

   print TRAFFICSTATS "$keyId,$id,$hId,$name,$state,$CCS,$kbps,$mBytes\n";
}

close TRAFFICSTATS;