อยากจะสอบทราบเรื่องการเพิ่มข้อมูลลงฐานข้อมูล โดยการเปรียบเทียบข้อมูลอะครับช่วยเเนะนำที่

$mysql1 = mysql_query("SELECT emp_id FROM $tb1");
while($arr = mysql_fetch_array($mysql1)){

      $mysql2 = mysql_query("SELECT * FROM $tb2 WHERE emp_id = '$arr[emp_id]'");
      $tel2 = mysql_fetch_array($mysql2);
      $update = mysql_query("UPDATE $tb1 SET tel = '$tel2[tel]' WHERE emp_id = '$arr[emp_id]'");


}

<?php

set_time_limit(300);
move_uploaded_file($_FILES["fileCSV"]["tmp_name"],$_FILES["fileCSV"]["name"]); 

include("connectdb.php");

$objCSV = fopen($_FILES["fileCSV"]["name"], "r");
//$objCSV=str_replace("$objArr[25]","'");

while (($objArr = fgetcsv($objCSV, 10000, ",")) !== FALSE) {
$mysql1 = "select * FROM employee WHERE emp_id";
$error24 = mysql_query($mysql1)or die(mysql_error());
while($arr = mysql_fetch_array($mysql1)){



      $mysql2 = mysql_query("SELECT * FROM `set` WHERE emp_id = '$arr[emp_id]'");
	  $error22 = mysql_query($mysql2)or die(mysql_error());
      $tel2 = mysql_fetch_array($mysql2);
	   $error23 = mysql_query($tel2)or die(mysql_error());
      $update = mysql_query("UPDATE employee SET tel = '$objArr[17]' WHERE emp_id = '$arr[emp_id]'");

$error21 = mysql_query($update)or die(mysql_error());

}

}
fclose($objCSV);

$mysql1 = "select * FROM employee WHERE emp_id";
$error24 = mysql_query($mysql1)or die(mysql_error());
while($arr = mysql_fetch_array($mysql1)){
      $mysql2 = mysql_query("SELECT * FROM `set` WHERE emp_id = '$arr[emp_id]'"or die(mysql_error()));
      $tel2 = mysql_fetch_array($mysql2);
      $update = mysql_query("UPDATE employee SET tel = '$tel2[fieldของTelในตารางSET]' WHERE emp_id = '$arr[emp_id]'");

}

<?php
set_time_limit(300);
move_uploaded_file($_FILES['fileCSV']['tmp_name'], $_FILES['fileCSV']['name']); 

include("connectdb.php");

$fp = fopen($_FILES['fileCSV']['name'], 'r');

while (($row = fgetcsv($fp, 10000, ',')) !== false) {
	mysql_query(
		"UPDATE `employee` SET `tel` = '$row[17]' WHERE `emp_id` = '$row[13]' LIMIT 1"
	);
}

fclose($fp);