aggregate function or the group by clause laravel code example

Example: laravel group by with where clause

$groupedSalesCampaign = Order::with('Campaign')
            ->where('isapproved','=','Y')
            ->groupBy('campaign_id')
            ->orderBy(DB::raw('COUNT(id)','desc'))
            ->get(array(DB::raw('COUNT(id) as totalsales'),'campaign_id'));