proses edit tugas php

<?php
    include('config.php');

    $id = $_POST['id'];
    $nama = $_POST['nama'];
    $alamat = $_POST['alamat'];
    $jenis_kelamin = $_POST['jenis_kelamin'];
    $agama = $_POST['agama'];
    $sekolah_asal = $_POST['sekolah_asal'];

    $sql = "UPDATE calon_siswa SET
    nama = '".$nama."',
    alamat = '".$alamat."',
    jenis_kelamin = '".$jenis_kelamin."',
    agama = '".$agama."',
    sekolah_asal = '".$sekolah_asal."'
    WHERE id = ".$id;

    $query = mysqli_query($db_connection, $sql);

    if ($query) {
        header('Location: list-siswa.php?status=sukses');
    }else {
        header('Location: list-siswa.php?status=gagal');
    }
?>