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 '%pink%'
	) as profit
group by
	nation,
	o_year
order by
	nation,
	o_year desc;
                                                                                   QUERY PLAN                                                                                   
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=3382853.40..3382857.88 rows=128 width=46) (actual time=699932.943..702979.198 rows=175 loops=1)
   Buffers: shared hit=30292338 read=740670 dirtied=66 written=2769
   ->  Sort  (cost=3382853.40..3382853.72 rows=128 width=46) (actual time=699917.683..700710.698 rows=3272630 loops=1)
         Sort Key: nation.n_name, (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone))
         Sort Method: quicksort  Memory: 558518kB
         Buffers: shared hit=30292338 read=740670 dirtied=66 written=2769
         ->  Nested Loop  (cost=2715493.37..3382848.92 rows=128 width=46) (actual time=198974.752..676298.965 rows=3272630 loops=1)
               Buffers: shared hit=30292330 read=740670 dirtied=66 written=2769
               ->  Nested Loop  (cost=2715493.37..3382812.41 rows=128 width=24) (actual time=198974.628..561205.190 rows=3272630 loops=1)
                     Buffers: shared hit=23747070 read=740670 dirtied=66 written=2769
                     ->  Nested Loop  (cost=2715493.37..3382562.20 rows=128 width=24) (actual time=198974.585..340294.849 rows=3272630 loops=1)
                           Buffers: shared hit=10818547 read=560763 written=750
                           ->  Merge Join  (cost=2715493.37..3382524.93 rows=128 width=28) (actual time=198974.526..224649.599 rows=3272630 loops=1)
                                 Merge Cond: ((partsupp.ps_partkey = lineitem.l_partkey) AND (partsupp.ps_suppkey = lineitem.l_suppkey))
                                 Buffers: shared hit=982582 read=560763 written=750
                                 ->  Index Scan using pk_partsupp on partsupp  (cost=0.00..603091.29 rows=8000000 width=12) (actual time=0.014..16564.132 rows=7999973 loops=1)
                                       Buffers: shared hit=328927 read=105282 written=750
                                 ->  Sort  (cost=2715493.35..2723473.04 rows=3191875 width=28) (actual time=198974.434..202612.376 rows=3272630 loops=1)
                                       Sort Key: part.p_partkey, lineitem.l_suppkey
                                       Sort Method: quicksort  Memory: 353979kB
                                       Buffers: shared hit=653655 read=455481
                                       ->  Hash Join  (cost=66848.30..2370675.53 rows=3191875 width=28) (actual time=4696.065..194064.938 rows=3272630 loops=1)
                                             Hash Cond: (lineitem.l_partkey = part.p_partkey)
                                             Buffers: shared hit=653652 read=455481
                                             ->  Seq Scan on lineitem  (cost=0.00..1670258.24 rows=60165024 width=24) (actual time=0.049..68303.304 rows=60045379 loops=1)
                                                   Buffers: shared hit=649154 read=419454
                                             ->  Hash  (cost=65522.00..65522.00 rows=106104 width=4) (actual time=4695.687..4695.687 rows=108938 loops=1)
                                                   Buckets: 16384  Batches: 1  Memory Usage: 3830kB
                                                   Buffers: shared hit=4495 read=36027
                                                   ->  Seq Scan on part  (cost=0.00..65522.00 rows=106104 width=4) (actual time=0.031..4609.901 rows=108938 loops=1)
                                                         Filter: ((p_name)::text ~~ '%pink%'::text)
                                                         Rows Removed by Filter: 1891062
                                                         Buffers: shared hit=4495 read=36027
                           ->  Index Scan using pk_supplier on supplier  (cost=0.00..0.28 rows=1 width=8) (actual time=0.033..0.034 rows=1 loops=3272630)
                                 Index Cond: (s_suppkey = lineitem.l_suppkey)
                                 Buffers: shared hit=9835965
                     ->  Index Scan using pk_orders on orders  (cost=0.00..1.94 rows=1 width=8) (actual time=0.066..0.066 rows=1 loops=3272630)
                           Index Cond: (o_orderkey = lineitem.l_orderkey)
                           Buffers: shared hit=12928523 read=179907 dirtied=66 written=2019
               ->  Index Scan using pk_nation on nation  (cost=0.00..0.27 rows=1 width=30) (actual time=0.032..0.032 rows=1 loops=3272630)
                     Index Cond: (n_nationkey = supplier.s_nationkey)
                     Buffers: shared hit=6545260
 Total runtime: 703088.009 ms
(43 rows)

COMMIT;
COMMIT