delete from ITEM
 where STOCK_MANAGEMENT_TYPE = 1
   and (not exists(select 1 from STOCK b
                     where b.ITEM_CODE = ITEM.ITEM_CODE)
    or exists(select 1 from STOCK b
                where b.ITEM_CODE = ITEM.ITEM_CODE
                  and b.ACTUAL_AMT = 0
                  and b.LAST_DELIVERY_DATE < '2023-01-01'))