BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	nation,
	o_year,
	sum(amount) as sum_profit
from
	(
		select
			n_name as nation,
			extract(year from o_orderdate) as o_year,
			l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
		from
			part,
			supplier,
			lineitem,
			partsupp,
			orders,
			nation
		where
			s_suppkey = l_suppkey
			and ps_suppkey = l_suppkey
			and ps_partkey = l_partkey
			and p_partkey = l_partkey
			and o_orderkey = l_orderkey
			and s_nationkey = n_nationkey
			and p_name like '%moccasin%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                  QUERY PLAN                                                                                   
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3369466.67..3369470.87 rows=120 width=46) (actual time=348940.951..352719.507 rows=175 loops=1)
   Buffers: shared hit=30563777 read=410978 dirtied=9 written=403
   ->  Sort  (cost=3369466.67..3369466.97 rows=120 width=46) (actual time=348928.529..350088.084 rows=3265714 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 557546kB
         Buffers: shared hit=30563777 read=410978 dirtied=9 written=403
         ->  Nested Loop  (cost=2703391.85..3369462.53 rows=120 width=46) (actual time=155258.576..326715.737 rows=3265714 loops=1)
               Buffers: shared hit=30563769 read=410978 dirtied=9 written=403
               ->  Nested Loop  (cost=2703391.85..3369428.30 rows=120 width=24) (actual time=155258.490..302332.011 rows=3265714 loops=1)
                     Buffers: shared hit=24032341 read=410978 dirtied=9 written=403
                     ->  Nested Loop  (cost=2703391.85..3369192.16 rows=120 width=24) (actual time=155258.351..207031.368 rows=3265714 loops=1)
                           Buffers: shared hit=11004843 read=357876 written=385
                           ->  Merge Join  (cost=2703391.85..3369157.21 rows=120 width=28) (actual time=155258.298..170307.346 rows=3265714 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=1189719 read=357876 written=385
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.027..7697.148 rows=7999821 loops=1)
                                       Buffers: shared hit=370055 read=64147 written=380
                                 ->  Sort  (cost=2703391.72..2710949.84 rows=3023249 width=28) (actual time=155258.191..157983.356 rows=3265714 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353438kB
                                       Buffers: shared hit=819664 read=293729 written=5
                                       ->  Hash Join  (cost=66773.24..2377974.21 rows=3023249 width=28) (actual time=2605.896..150077.201 rows=3265714 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=819661 read=293729 written=5
                                             ->  Seq Scan on lineitem  (cost=0.00..1676916.74 rows=60405174 width=24) (actual time=0.065..37915.192 rows=59984909 loops=1)
                                                   Buffers: shared hit=798687 read=274178 written=5
                                             ->  Hash  (cost=65522.00..65522.00 rows=100099 width=4) (actual time=2605.663..2605.663 rows=108891 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3829kB
                                                   Buffers: shared hit=20971 read=19551
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=100099 width=4) (actual time=0.028..2518.562 rows=108891 loops=1)
                                                         Filter: ((p_name)::text ~~ '%moccasin%'::text)
                                                         Rows Removed by Filter: 1891109
                                                         Buffers: shared hit=20971 read=19551
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.010..0.010 rows=1 loops=3265714)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9815124
                     ->  Index Only Scan using orders_o_orderkey_o_orderdate_idx on orders  (cost=0.00..1.96 rows=1 width=8) (actual time=0.028..0.028 rows=1 loops=3265714)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Heap Fetches: 3265714
                           Buffers: shared hit=13027498 read=53102 dirtied=9 written=18
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.005..0.005 rows=1 loops=3265714)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6531428
 Total runtime: 352831.144 ms
(44 rows)

COMMIT;
COMMIT