select  i_product_name
             ,i_brand
             ,i_class
             ,i_category
             ,avg(inv_quantity_on_hand) qoh
       from inventory
           ,date_dim
           ,item
           ,warehouse
       where inventory.inv_date_sk=date_dim.d_date_sk
              and inventory.inv_item_sk=item.i_item_sk
              and inventory.inv_warehouse_sk = warehouse.w_warehouse_sk
              and date_dim.d_month_seq between 1193 and 1193 + 11
              and inv_date between '1999-06-01' and '2000-05-31'
       group by i_product_name
                       ,i_brand
                       ,i_class
                       ,i_category with rollup
order by qoh, i_product_name, i_brand, i_class, i_category
limit 100;