text: -- using 1523417108 as a seed to the RNG
  
  
  select
  	100.00 * sum(case
  		when p_type like 'PROMO%'
  			then l_extendedprice * (1 - l_discount)
  		else 0
  	end) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue
  from
  	lineitem,
  	part
  where
  	l_partkey = p_partkey
  	and l_shipdate >= date '1995-03-01'
  	and l_shipdate < date '1995-03-01' + interval '1' month
  limit 1;
  