BEGIN;
BEGIN
EXPLAIN
select
	n_name,
	sum(l_extendedprice * (1 - l_discount)) as revenue
from
	customer,
	orders,
	lineitem,
	supplier,
	nation,
	region
where
	c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and l_suppkey = s_suppkey
	and c_nationkey = s_nationkey
	and s_nationkey = n_nationkey
	and n_regionkey = r_regionkey
	and r_name = 'ASIA'
	and o_orderdate >= date '1994-01-01'
	and o_orderdate < date '1994-01-01' + interval '1 year'
group by
	n_name
order by
	revenue desc;
                                                                                     QUERY PLAN                                                                                     
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=2082353.15..2082353.22 rows=25 width=58)
   Sort Key: (sum((lineitem.l_extendedprice * ('1'::numeric - lineitem.l_discount)))) DESC
   ->  Finalize GroupAggregate  (cost=2081968.43..2082352.57 rows=25 width=58)
         Group Key: nation.n_name
         ->  Gather Merge  (cost=2081968.43..2082351.89 rows=50 width=58)
               Workers Planned: 2
               ->  Partial GroupAggregate  (cost=2080968.40..2081346.09 rows=25 width=58)
                     Group Key: nation.n_name
                     ->  Sort  (cost=2080968.40..2081043.88 rows=30190 width=38)
                           Sort Key: nation.n_name
                           ->  Parallel Hash Join  (cost=421225.23..2078722.00 rows=30190 width=38)
                                 Hash Cond: ((orders.o_custkey = customer.c_custkey) AND (supplier.s_nationkey = customer.c_nationkey))
                                 ->  Parallel Hash Join  (cost=380813.06..2017158.43 rows=754931 width=50)
                                       Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                                       ->  Parallel Hash Join  (cost=2248.79..1523122.58 rows=5003652 width=54)
                                             Hash Cond: (lineitem.l_suppkey = supplier.s_suppkey)
                                             ->  Parallel Seq Scan on lineitem  (cost=0.00..1406207.60 rows=25018260 width=24)
                                             ->  Parallel Hash  (cost=2144.63..2144.63 rows=8333 width=38)
                                                   ->  Merge Join  (cost=2.80..2144.63 rows=8333 width=38)
                                                         Merge Cond: (supplier.s_nationkey = nation.n_nationkey)
                                                         ->  Parallel Index Only Scan using supplier_s_nationkey_s_suppkey_idx on supplier  (cost=0.29..1912.96 rows=41667 width=8)
                                                         ->  Sort  (cost=2.50..2.52 rows=5 width=30)
                                                               Sort Key: nation.n_nationkey
                                                               ->  Hash Join  (cost=1.07..2.45 rows=5 width=30)
                                                                     Hash Cond: (nation.n_regionkey = region.r_regionkey)
                                                                     ->  Seq Scan on nation  (cost=0.00..1.25 rows=25 width=34)
                                                                     ->  Hash  (cost=1.06..1.06 rows=1 width=4)
                                                                           ->  Seq Scan on region  (cost=0.00..1.06 rows=1 width=4)
                                                                                 Filter: (r_name = 'ASIA'::bpchar)
                                       ->  Parallel Hash  (cost=362157.46..362157.46 rows=943825 width=12)
                                             ->  Parallel Seq Scan on orders  (cost=0.00..362157.46 rows=943825 width=12)
                                                   Filter: ((o_orderdate >= '1994-01-01'::date) AND (o_orderdate < '1995-01-01 00:00:00'::timestamp without time zone))
                                 ->  Parallel Hash  (cost=28594.88..28594.88 rows=625020 width=8)
                                       ->  Parallel Index Only Scan using customer_c_nationkey_c_custkey_idx on customer  (cost=0.43..28594.88 rows=625020 width=8)
(34 rows)

COMMIT;
COMMIT