mysqli_query（）期望至少2个参数，给定1个参数，mysqli_num_rows（）期望参数1

Question

** 警告：mysqli_query（）至少需要2个参数，第16行的C：\ xampp \ htdocs \ final project PWL 2019 \ regis \ cek-login.php中给出1个参数

警告：mysqli_num_rows（）期望参数1为mysqli_result，在第18行的C：\ xampp \ htdocs \ final project PWL 2019 \ regis \ cek-login.php中给定null **

<?php

$server = "localhost"; // Nama hostnya
$user = "root"; // Username
$pass = ""; // Password (Isi jika menggunakan password)
$db = "finpro"; // Nama databasenya

$koneksi = new mysqli($server, $user, $pass, $db);

if(isset($_POST['email'])) {
    $email=$_POST['email'];
    $password=md5($_POST['password']);

    $sql = "SELECT * FROM regis_lib WHERE email='$email'AND password='$password'";

    $result=mysqli_query($sql);

    if (mysqli_num_rows($result)==1) {
        echo "You Have Success logged in";
        exit();
    }
    else{
        echo "Wrong Email/Password";
        exit();
    }
}
?>