EXPLAIN (ANALYZE, COSTS)

-- using default substitutions

select

o_year,

sum(case

when nation = 'BRAZIL' 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,

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 = 'AMERICA'

and s_nationkey = n2.n_nationkey

and o_orderdate between date '1995-01-01' and date '1996-12-31'

and p_type = 'ECONOMY ANODIZED STEEL'

) as all_nations

group by

o_year

order by

o_year;