laravel sql查询

        $total = $query->count(DB::raw("distinct(product_skus.id)"));
        $query = $query->orderBy('product_skus.id', 'desc');
        $skuList = $query->distinct('product_skus.id')->paginate($pageSize, ['product_skus.id']);
        $skuListArr = $query->distinct('product_skus.id')->get()->toArray();