php update จากอีกตารางนึงไปอีกตารางนึงช่วยแนะนำหน่อยครับ

<?php
session_start();  
include 'connect.php';


        $topup_id = $_GET['topup_id'];
        $member_id = $_GET['member_id'];
        $money_topup = $_GET['money_topup'];
        $topup_status = 'สำเร็จ';
        
        $sql = "UPDATE topup SET topup_status = '$topup_status' WHERE topup_id = '$topup_id'";
        $result = mysqli_query($conn,$sql);

        $sql2 = "UPDATE member SET member_coin = '$money_topup' WHERE topup_id = '$topup_id'";
        $result2 = mysqli_query($conn,$sql2);
        
        if($result2){
                echo "<script type='text/javascript'>";
                echo "alert('เพิ่มเงิน $money_topup สำเร็จ');";
                echo "window.location ='admin_topup_check.php'; ";
                echo "</script>";
        }else{
                echo "error";
        }

?>