ช่วยแก้โค้ดตารางเรียนให้หน่อยค่ะ คือยากให้มัน insert ข้อมูลลง database

<table width="200" border="0" align="center">
      <tr>
        <td>
            <?php
				$connectdb=mysql_connect("localhost","test","admin")or die("no connect database");
				mysql_query("SET CHARACTER SET utf8");
				mysql_query("use project");
				//$sql="select * from room_period_school_days where room_id='".$_GET['room_id']."' ";
				//echo $sql;

		$sqlSchoolDays = "
			SELECT 
				t1.school_days_id 
				, t2.school_days_name
				, t2.school_days_status
			FROM 
				room_period_school_days AS t1
				LEFT JOIN school_days AS t2 ON t1.school_days_id=t2.school_days_id
			WHERE t1.room_id = 1
			GROUP BY t1.school_days_id
			ORDER BY t1.school_days_id ASC
		";
		
				$resSchoolDays = mysql_query($sqlSchoolDays);
				
				$sqlPeriod = "
					SELECT
						t1.period_id
						, t2.period_time_start
						, t2.period_time_end
					FROM 
						room_period_school_days AS t1
						LEFT JOIN period AS t2 ON t1.period_id=t2.period_id
					WHERE t1.room_id = 1
					GROUP BY t1.period_id
					ORDER BY t1.period_id ASC
				";
				
				$resPeriod = mysql_query($sqlPeriod);
				
				?>
						</p>
						  <form action="testCMD.php" method="post" name="rpsd-form" id="rpsd-form">
							<p align="center">เลือกกลุ่มและวันเวลาที่ต้องการใช้</p>
						  <p align="center">
							<select name="Group" id="select">
								<option value="1"> กลุ่ม1 </option>
								<option value="2"> กลุ่ม2 </option>
								<option value="3"> กลุ่ม3 </option>
								<option value="4"> กลุ่ม4 </option>
								<option value="5"> กลุ่ม5 </option>
								</select>
							</p>
						  <p align="center">  
							<table width="583" height="247" border="1">
							  <tr>
                <td>วันที่/เวลา</td>
                <?php
	while ($rowPeriod = mysql_fetch_array($resPeriod)) {
		echo '<td>'.$rowPeriod['period_time_start'].' - '.$rowPeriod['period_time_end'].'</td>';
	}
	?>
              </tr>
              <?php
	while ($rowSchoolDays = mysql_fetch_array($resSchoolDays)) {
		echo'<tr>';
			echo '<td>'.$rowSchoolDays['school_days_name'].'</td>';
			$sqlRPSD = "
				SELECT * FROM room_period_school_days
				WHERE 
					school_days_id = ".$rowSchoolDays['school_days_id']."
					AND room_id = 1
				ORDER BY period_id ASC
			";
			$resRPSD = mysql_query($sqlRPSD);
			while ($rowRPSD = mysql_fetch_array($resRPSD)) {
				$checked = "";
				if($rowRPSD['status'] == "Y"){
					$checked = "checked";
				}
				echo '<td><input type="checkbox" name="rpsd_id_'.$rowRPSD['rpsd_id'].'" value="Y" '.$checked.' /></td>';
			}

		echo'</tr>';
	}
  ?>
            </table>
            <input type="submit" name="submit" value="Update" />
          </form></td>
      </tr>
    </table>