Masalah koneksi

ini kenapa ya seperti ini? Warning: mysqli_query() expects at least 2 parameters, 1 given in C:\xampp\htdocs\spk\hasil.php on line 10

<?php
include('header.php');
include('koneks.php');
include('function.php');
include ("function_peta.php");

	$w = array();
	$v = array();
	$hasil = array();
	$sql = mysqli_query ("SELECT * FROM tb_rm") or die (mysqli_error());

	$kenyamanan = get_bobot(round($_POST['kenyamanan']));
	$kebersihan = get_bobot_dua(round($_POST['kebersihan']));
	$harga = get_bobot_tiga($_POST['harga']);
	$pelayanan = get_bobot_dua(round($_POST['pelayanan']));
	$jarak = get_bobot_empat($_POST['jarak']);

	array_push($w,$kenyamanan);
	array_push($w,$kebersihan);
	array_push($w,$harga);
	array_push($w,$pelayanan);
	array_push($w,$jarak);

	$alamat = $_POST['lokasi'];
	$lat_lokasi = $_POST['latitude'];
	$lng_lokasi = $_POST['longitude'];
	if ($alamat != '')
		$geo_alamat = geocode($alamat);
	else
		$geo_alamat = array($_POST['latitude'],$_POST['longitude'])


?>