ขอวิธีทำด้วยครับ เพิ่ม ลบ แก้ไข เกรดลงในฐานข้อมูล และสามารถแสดงผลลัพธ์ได้

<form action="insert_grade.php" method="post" name='form1'>

<table width="62%" border="0" align="center" cellpadding="2" cellspacing="3">
  <tr>
    <td align="right">id</td>
    <td><label>
      <input type="text" name="id" id="id">
    </label></td>
  </tr>
  <tr>
    <td align="right">name-lastname</td>
    <td><input type="text" name="name_lastname" id="name_lastname"></td>
  </tr>
  <tr>
    <td align="right">Grade</td>
    <td><input type="text" name="grade" id="grade"></td>
  </tr>
  <tr>
    <td align="right">Score</td>
    <td><input type="text" name="score" id="score"></td>
  </tr>
  <tr>
    <td colspan="2"><label>
      <input type="submit" name="button" id="button" value="Submit">
    </label></td>
    </tr>
</table>
</form>

<?
$objConnect = mysql_connect("localhost","root","1234") or die("Error Connect to Database");
$objDB = mysql_select_db("db_grade");
$strSQL = "INSERT INTO tb_grade ";
$strSQL .="(id,name_lastname,grade,score) ";
$strSQL .="VALUES ";
$strSQL .="('".$_POST["id"]."','".$_POST["name_lastname"]."','".$_POST["grade"]."' ";
$strSQL .=",'".$_POST["score"]."') ";
$objQuery = mysql_query($strSQL);
if($objQuery)
{
	echo "Save Done.";
}
else
{
	echo "Error Save [".$strSQL."]";
}
mysql_close($objConnect);
?>

<?
$db_Host 	= 	"localhost"; 
$db_User	=	"root"; // ชื่อล็อคอินตอนเข้า phpmyadmin
$db_Pass	=	"1234"; // ชื่อพาสเวิดตอนเข้า phpmyadmin
$db_Name	=	"db_grade"; // ชื่อ database name

$objConnect = mysql_connect($db_Host,$db_User,$db_Pass) or die("Error Connect to Database");
$objDB = mysql_select_db($db_Name);
$strSQL = "INSERT INTO tb_grade ";
$strSQL .="(id,name_lastname,grade,score) ";
$strSQL .="VALUES ";
$strSQL .="('".$_POST["id"]."','".$_POST["name_lastname"]."','".$_POST["grade"]."' ";
$strSQL .=",'".$_POST["score"]."') ";
$objQuery = mysql_query($strSQL);
if($objQuery)
{
	echo "Save Done.";
}
else
{
	echo "Error Save [".$strSQL."]";
}
mysql_close($objConnect);
?>

<?
session_start();

include "connect.php";

$hid=$_GET['hid'];


$sql = "delete from tb_history  where h_id='$hid' ";
$result = mysql_db_query($dbname,$sql);


if ($result) {
	echo"<meta http-equiv=\"refresh\" content=\"0;URL=history_back.php\" />";
}      
	
?>

<?
# Database - Start
$db_HostName   = "localhost";
$db_Name = "tb_grade";
$db_UserName   = "root";
$db_Password = "1234";
$link = mysql_connect($db_HostName , $db_UserName , $db_Password) or die ("Cannot connect to database '$db_Name' : ".mysql_error());
mysql_select_db ($db_Name);
mysql_query("SET NAMES TIS620");
# Database - End
?>

<style type="text/css">
td {font-family:sans-serif;
font-size:12px;
}
</style>

<?
@include ("connect.inc.php");
$sql	=	" SELECT * FROM tb_grade ORDER BY id ASC";
$qe	=	mysql_query($sql);
?>
<table width="500" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td width="10%">ID</td>
    <td width="20%">Name-Lastname</td>
    <td width="20%">Grade</td>
    <td width="20%">Score</td>
    <td width="15%">Edit</td>
    <td width="15%">Del</td>
  </tr>
<? 
$bg	=	1;
while($rw = mysql_fetch_array($qe)){$bg++;
if($bg%2 == 0){
	$bgr	=	"#FFF";
}else{
	$bgr	=	"#CCC";
}
?> 
  <tr bgcolor="<?=$bgr?>"> 
    <td><?=$rw['id']?></td>
    <td><?=$rw['name_lastname']?></td>
    <td><?=$rw['grade']?></td>
    <td><?=$rw['score']?></td>
    <td><a href="update_grade.php?action=edit&id=<?=$rw['id']?>">edit</a></td>
    <td><a  href= "delete_grade.php?action=del&id=<?=$rw['id']?>" onClick="return confirm('คุณต้องการลบ?')">delete</a></td>
  </tr>
<? }?>  
</table> 
</table>