-- @(#)8.sql	2.1.8.1
-- TPC-H/TPC-R National Market Share Query (Q8)
-- Functional Query Definition
-- Approved February 1998
:b
:x
:o
select
	o_year,
	sum(case
		when nation = ':1' then volume
		else 0
	end) / sum(volume) as mkt_share
from
	(
		select
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) as volume,
			n2.n_name as nation
		from
			part /*! force index (primary) */,
			supplier /*! force index (primary) */,
			lineitem /*! force index (i_l_orderkey_quantity) */,
			orders /*! force index (i_o_custkey) */,
			customer /*! force index (i_c_nationkey) */,
			nation n1 /*! force index (i_n_regionkey) */,
			nation n2 /*! force index (primary) */,
			region /*! ignore index (primary) */
		where
			p_partkey = l_partkey
			and s_suppkey = l_suppkey
			and l_orderkey = o_orderkey
			and o_custkey = c_custkey
			and c_nationkey = n1.n_nationkey
			and n1.n_regionkey = r_regionkey
			and r_name = ':2'
			and s_nationkey = n2.n_nationkey
			and o_orderdate between date '1995-01-01' and date '1996-12-31'
			and p_type = ':3'
	) as all_nations
group by
	o_year
order by
	o_year;
:e