php mysql รบกวนช่วยชี้แนะหน่อยครับเรื่อง การเช็ค ห้อง,วัน,เวลา การจองห้องประชุม

<?
if( $_POST["Submit"] == "ยืนยันข้อมูล" ) :
	echo print_r($_POST);
	
	$Start_Date = $_POST["Start_Date"];
	$End_Date = $_POST["End_Date"];
	$Stimehr = $_POST["start_time_hh"];
	$Stimemin = $_POST["start_time_mm"];
	$Etimehr = $_POST["end_time_hh"];
	$Etimemin = $_POST["end_time_mm"];

	$start_time_db = $Stimehr .$Stimemin."00";
	$end_time_db =$Etimehr .$Etimemin."00";

	$sqls = SELECT * FROM tbqueue_meeting WHERE ID_Room = '$ID_Room' and (Start_Date between '$Start_Date'and'$End_Date') or (End_Date between '$Start_Date' and '$End_Date') or (Start_time between '$start_time_db'and'$end_time_db') or (End_time between '$start_time_db'and'$end_time_db');
	
		$results =  mysql_query($sqls) or die(mysql_error());
		 
		$nums= mysql_num_rows($results);
		
		echo $nums;
			if ($nums <= 0)
				{
					                                   echo ('จองได้');
					exit;
				}
			else
				{	
					                                   echo ('ช่วงเวลาดังกล่าวถูกจองไปแล้ว');
					exit;
				}
		

		$objConnect = mysql_connect("localhost","root","root") or die("Error Connect to Database");
		$objDB = mysql_select_db("meameeting");
		mysql_query("SET NAMES UTF8");


		$strSQL = "select Authority from tbroom where ID_Room = '$ID_Room'" ;
		$result = mysql_query($strSQL);
		$row = mysql_fetch_array($result);
		$Authority = $row["Authority"];

		if ($Authority == 'Public')
			{ 
				$status = "1";
		
			}
		else
			{
				$status = "2";
			                             echo "<scrip> alert('คุณต้องรอการอนุมัติก่อน')</script>";
			} 


	$strSQL = "INSERT INTO tbqueue_meeting ";
	$strSQL .="(meet_name,ID_Member,ID_Room,Start_Date,End_Date,Start_Time,End_Time,amount_people,Employee,Equip,Tel,Mobile,Status)";
	$strSQL .="VALUES ";
	$strSQL .="('".$_POST["meet_name"]."','".$ID_Member."','".$ID_Room."','".$_POST["Start_Date"]."' ";
	$strSQL .=",'".$_POST["End_Date"]."','".$start_time_db."','".$end_time_db."' ";
	$strSQL .=",'".$_POST["amount_people"]."','".$_POST["Employee"]."','".$_POST["Equip"]."' ";
	$strSQL .=",'".$_POST["Tel"]."','".$_POST["Mobile"]."','".$status."') ";



	$objQuery = mysql_query($strSQL);
	if($objQuery)
	{
	echo '<script type="text/javascript">alert("success"); document.location="index2.php";</script>';

	}
	else
	{
	echo "Error Save [".$strSQL."]";
	}


	mysql_close($objConnect);


endif;
?>