text: --------------------------------------------------------------------------------
  --Example #18: Compute the sum of weight based on a range of height between 10 less
  --than the current row's value to 5 more than the current row's value
  --------------------------------------------------------------------------------
  select c.*
       , sum(c.weight) over (order by c.height
                             range between 10 preceding
                                       and  5 following) as sum_10_5
    from childstat c
  ;
  