multiple table select

<?php 
	session_start();
	include("connection.php");
	$temp=$_POST['productUpdateId'];
	$arr=explode(":-",$temp);
	$pId=$arr[0];
	$_SESSION['updateNeedPId']=$pId;
	
	$sqlquery_get_name_details="SELECT *  FROM p_details pD,p_name pN";
  	$nameDet_ref=mysqli_query($con,$sqlquery_get_name_details);
	if($row=mysqli_fetch_array($nameDet_ref)){
	$pName=$row["pN p_name"];
	$pDet=$row["pD.p_det"];
	$_SESSION['updateNeedPName']=$pName;
	$_SESSION['updateNeedPDet']=$pDet;
	}
	
?>


THE ERRORS ARE;
Notice: Undefined index: pN p_name in D:\wamp\dsdsd\updateSelect.php on line 12
Notice: Undefined index: pD.p_det in D:\wamp\wdsdsd\updateSelect.php on line 13