CRUD Mysqli input.php

<?php
include"koneksi.php";

$nama = $_POST['nama'];
$jenis_kelamin = $_POST['jenis_kelamin'];
$alamat = $_POST['alamat'];
$telepon = $_POST['telepon'];

$query = "insert INTO mahasiswa SET
                                nama = '$nama',
                                jenis_kelamin = '$jenis_kelamin',
                                alamat = '$alamat',
                                telepon = '$telepon'
                                ";

mysqli_query($koneksi, $query)
or die ("Gagal Perintah SQL".mysql_error());
header('location:index.php');

?>