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-- @(#)8a.sql 2.1.8.1
-- TPC-H/TPC-R National Market Share Query (Q8)
-- Variant A
-- Approved February 1998
:x
:o
select
o_year,
sum(decode(nation, ':1', volume, 0)) / 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,
supplier,
lineitem,
orders,
customer,
nation n1,
nation n2,
region
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'
) all_nations
group by
o_year
order by
o_year;
:n -1