Try:
$rows = ExecuteRows("SELECT uraian_pekerjaan,vol,sat,harga_sat,jumlah_harga FROM rab");
if (!empty($rows)) {
foreach ($rows as $row) {
$uraian = $row["uraian_pekerjaan"];
$vol = $row["vol"];
$sat = $row["sat"];
$harga_sat = $row["harga_sat"];
$jumlah_harga = $row["jumlah_harga"];
Execute("INSERT INTO rab_pakai (uraian_pekerjaan, vol, sat, harga_sat, jumlah_harga) VALUES ('$uraian','$vol','$sat','$harga_sat','$jumlah_harga')");
}
}