drop view q18_tmp_cached;
drop table q18_large_volume_customer_cached;

create view q18_tmp_cached as
select
	l_orderkey,
	sum(l_quantity) as t_sum_quantity
from
	lineitem
where
	l_orderkey is not null
group by
	l_orderkey;

create table q18_large_volume_customer_cached as
select
	c_name,
	c_custkey,
	o_orderkey,
	o_orderdate,
	o_totalprice,
	sum(l_quantity)
from
	customer,
	orders,
	q18_tmp_cached t,
	lineitem l
where
	c_custkey = o_custkey
	and o_orderkey = t.l_orderkey
	and o_orderkey is not null
	and t.t_sum_quantity > 300
	and o_orderkey = l.l_orderkey
	and l.l_orderkey is not null
group by
	c_name,
	c_custkey,
	o_orderkey,
	o_orderdate,
	o_totalprice
order by
	o_totalprice desc,
	o_orderdate 
limit 100;