PHP & Mysql : PHP select

$conn=mysql_connect ("localhost","root","");
if (!$conn){
echo "Error Koneksi";
}else {
mysql_select_db("sistem_kuliah",$conn);
$sql = "select * from mahasiswa";

$result = mysql_query($sql);
while ($row = mysql_fetch_array($result)){

echo $row["nim"]. "-" . $row["nama"] . "
";
}
}


hasilnya :

0180000536-andri
0280000254-tung desem
085555-indira
0925000-adi
0925000-adi