ขอความช่วยเหลือค่ะ .. เรื่อง คำสั่ง sql ค่ะ ต้องการเพิ่ม filed ใหม่ ในตารางเดิม

$rows = array(
	array(
		'id' => '01',
		'data' => 'aaa',
	),
	array(
		'id' => '01',
		'data' => 'bbb',
	),
	array(
		'id' => '02',
		'data' => 'aaa',
	),
	array(
		'id' => '02',
		'data' => 'bbb',
	),
	array(
		'id' => '03',
		'data' => 'aaa',
	),
	array(
		'id' => '04',
		'data' => 'aaa',
	),
	array(
		'id' => '05',
		'data' => 'aaa',
	),
	array(
		'id' => '05',
		'data' => 'bbb',
	),
);


$counter = 0;
$last_id = NULL;
foreach ($rows as $row)
{
	$counter++;
	if ($last_id == NULL OR ($last_id !=$row['id'] AND $counter != 2)) echo '<br /> ';

	if ($counter == 2 AND $last_id !=$row['id'])
	{
		echo 'NULL <br />';
		$counter = 1;
	}
	elseif ($counter == 2)
	{
		echo $row['data']. ' ';
	}

	if ($counter == 1) echo $row['id'].' '.$row['data'].' ';

	$last_id = $row['id'];
	if ($counter == 2) $counter = 0;
}
if ($counter == 1) echo 'NULL';