SELECT userorders.`delivered` as delivered_status, items.`name` as itemname,
sizes.`size` as sizename,SUM(userorders.`order_qty`) as order_quantity,
sizes.`qty` as stockremaining FROM userorders inner join sizes on
userorders.`size`=sizes.`id` inner join items on  sizes.`item_id`=items.`id`
 WHERE 1 group by userorders.`delivered`, userorders.`size`;

$userorders = DB::table('userorders')
            ->join('sizes', 'userorders.size', '=', 'sizes.id')
            ->join('items', 'sizes.item_id', '=', 'items.id')
            ->join('categories', 'items.category_id', '=', 'categories.id')
            ->select('SUM(userorders.order_qty) as order_quantity','userorders.delivered as delivered_status', 'items.name as itemname','categories.name as categoryname', 'sizes.size as sizename','sizes.qty as stockremaining')
            ->groupBy('userorders.delivered', 'userorders.size')
            ->get();

$userorders = DB::table('userorders')
                ->join('sizes', 'userorders.size', '=', 'sizes.id')
                ->join('items', 'sizes.item_id', '=', 'items.id')
                ->join('categories', 'items.category_id', '=', 'categories.id')
                ->SUM('userorders.order_qty');