text: select
      sum(l_extendedprice * l_discount) as revenue
      from lineitem
  where
      l_shipdate >= date '1992-12-01'
      and l_shipdate < date '1998-12-01'
      and l_discount between 0.04 - 0.02
      and 0.04 + 0.02
      and l_quantity < 15
  