[php] สอบถามวิธีการ insert ข้อมูล พร้อม update ลงบนตาราง (คล้ายระบบจองห้องค่ะ)

<div class="row">
          		<div class="col-md-12">
          		<h2 class="text-center"> COURSE REGISTER</h2>
          		 <form role="form" class="text-center" method="post" action="save_course.php"> 
          		<table class="table table-hover table-bordered ">
          			<th class="active text-center"><h3>Information</h3></th>
          			<th class="active text-center"><h3> Edit </h3></th>
          			
          			<tr class="info">
          			<td>USERNAME </td>
          			<td><?=$objResult["student_username"];?></td>

          			</tr>
          			</th>

          			<tr class="info">
          			<td>NAME </td>
          			<td><?=$objResult["student_name"];?></td>
          			</tr>
          			
          			<tr class="info">
          			<td>SCHOOL </td>
          			<td><?=$objResult["student_school"];?></td>
          			</tr>
          			
          			<tr class="info">
          			<td>LEVEL </td>
          			<td><?=$objResult["student_level"];?></td>
          			</tr>
      
      				<tr class="info">
          			<td>E-MAIL </td>
          			<td><?=$objResult["student_email"];?></td>
          			</tr>

               			
          			<tr class="info">
          			<td>COURSE NAME</td>
          			<td><input name="course" class="form-control" type="text" id="course" placeholder="Enter course name"></td>
          			</tr>
          			
          			<tr class="info">
          			<td>COURSE TYPE (Individual Or Group)</td>
          			<td><input name="coursetype" class="form-control" type="text" id="coursetype" placeholder="Enter course type"></td>
          			</tr>
          			
          			<tr class="info">
          			<td>COURSE FREQUENCY</td>
          			<td><input name="coursefre" class="form-control" type="text" id="coursefre" placeholder="Enter course frequency per week"></td>
          			</tr>
          			
          			<tr class="info">
          			<td>DAY</td>
          			<td><input name="day" class="form-control" type="text" id="day" placeholder="Enter day that you want to study"></td>
          			</tr>
          		</table>
          		<button type="submit" class="btn btn-default bg-button1" value="Register course" >REGISTER </button>
          		</form>
          		</div>
          		</div>

<? session_start();
	if($_SESSION['student_id'] == ""){
		echo "Please Login!";
		exit();
	}
	mysql_connect("localhost","root","1234");
	mysql_select_db("regis");

	if($_POST['password'] != $_POST['conpassword']){
		echo "Password not Match";
		exit();
	}

	
	$sql = "INSERT INTO course (course_name,course_type,course_frequency_per_week,course_day) VALUES ('$_POST[course]','$_POST[coursetype]','$_POST[coursefre]','$_POST[day]')";
	$sqlQuery = mysql_query($sql);
	
	
	
	if($sql){
		echo "<script language='javascript'> alert(' Course Register Success');
				</script>";
		echo '<script type="text/javascript">window.location = "course.php";</script>';
	}else{
		echo "Error:";
	}
	
	mysql_close();
	?>