การ update ข้อมูลค่ะ ช่วยดูหน่อย การ Update ค่า balance ค่ะ ตอนนี้มันไปอัพเดตให้กับทุกคน

mysql_query("update member set balance = balance + $amount where member_id='$member_id'");

<?php
session_start() ;
if(!session_is_registered("login_true_admin")) {
echo "<meta http-equiv='refresh' content='0;url=index.php'>" ;
exit() ;
}?>
<?php

session_start() ;
include("../config.inc.php") ;

mysql_select_db($db) ;
mysql_query("SET NAMES TIS620");
$sql = "select * from deposit" ;
$result = mysql_query($sql) ;
$num_result  = mysql_num_rows($result) ;
$dbarr = mysql_fetch_array($result) ;
$date=date('d/m/Y');
       
$result = "INSERT INTO deposit (member_id,name,date,amount)
VALUES('".$member_id."','".$name."','".$date."','".$amount."')";
$result = mysql_query($result);
$db_query=mysql_db_query($db,$result);


mysql_query("update member set balance = balance + $amount where member_id='".$member_id."' ");
   $db_query=mysql_db_query($db,$result);
   $dbarr = mysql_fetch_array($result) ;
   $sql2 = "SELECT * FROM member WHERE id='$id' ";

echo " บันทึกข้อมูลเรียบร้อยแล้ว ";
mysql_close();

?>