Warning: mysqli_query()

Notice: Undefined variable: no in C:\xampp\htdocs\Absensi\proses.php on line 41 Warning: mysqli_query() expects at least 2 parameters, 1 given in C:\xampp\htdocs\Absensi\proses.php on line 42

bantu dong ini kodingnya

$server='localhost'; $user='root'; $password=''; $database='data_absen';

$koneksi=mysqli_connect($server, $user, $password);

mysqli_select_db($koneksi, $database);

$nim=$_POST["nim"]; $nama_mahasiswa=$_POST["nama"]; $mata_kuliah=$_POST["mk"]; $keterangan=$_POST["keterangan"];

echo $nim; echo'

'; echo $nama_mahasiswa; echo'

'; echo $mata_kuliah; echo'

'; echo $keterangan; echo'

';

(40)$sql="INSERT INTO absen_1si-4x(no, nim, nama_mahasiswa, mata_kuliah, keterangan) (41) VALUES('no', '$nim', '$nama_mahasiswa', '$mata_kuliah', '$keterangan')"; (42)mysqli_query($sql);