BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	ps_partkey,
	sum(ps_supplycost * ps_availqty) as value
from
	partsupp,
	supplier,
	nation
where
	ps_suppkey = s_suppkey
	and s_nationkey = n_nationkey
	and n_name = 'CANADA'
group by
	ps_partkey having
		sum(ps_supplycost * ps_availqty) > (
			select
				sum(ps_supplycost * ps_availqty) * 0.0000100000
			from
				partsupp,
				supplier,
				nation
			where
				ps_suppkey = s_suppkey
				and s_nationkey = n_nationkey
				and n_name = 'CANADA'
		)
order by
	value desc;
                                                                                 QUERY PLAN                                                                                 
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=135989.33..136789.33 rows=320000 width=12) (actual time=28090.046..28091.134 rows=8690 loops=1)
   Sort Key: (sum((public.partsupp.ps_supplycost * (public.partsupp.ps_availqty)::double precision)))
   Sort Method: quicksort  Memory: 792kB
   Buffers: shared hit=416965 read=261547 written=3
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=49764.49..49764.50 rows=1 width=8) (actual time=10804.524..10804.524 rows=1 loops=1)
           Buffers: shared hit=238162 read=101092
           ->  Nested Loop  (cost=79.26..47364.49 rows=320000 width=8) (actual time=2.383..10629.958 rows=324320 loops=1)
                 Buffers: shared hit=238162 read=101092
                 ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=2.310..64.975 rows=4054 loops=1)
                       Buffers: shared hit=1854 read=13
                       ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.009..0.020 rows=1 loops=1)
                             Filter: (n_name = 'CANADA'::bpchar)
                             Rows Removed by Filter: 24
                             Buffers: shared hit=1
                       ->  Bitmap Heap Scan on supplier  (cost=79.26..2350.26 rows=4000 width=8) (actual time=2.292..60.063 rows=4054 loops=1)
                             Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                             Buffers: shared hit=1853 read=13
                             ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.944..1.944 rows=4054 loops=1)
                                   Index Cond: (s_nationkey = public.nation.n_nationkey)
                                   Buffers: shared read=13
                 ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.00..10.44 rows=80 width=12) (actual time=0.147..2.569 rows=80 loops=4054)
                       Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                       Buffers: shared hit=236308 read=101079
   ->  HashAggregate  (cost=52964.49..56964.49 rows=320000 width=12) (actual time=27913.401..28084.536 rows=8690 loops=1)
         Filter: (sum((public.partsupp.ps_supplycost * (public.partsupp.ps_availqty)::double precision)) > $2)
         Rows Removed by Filter: 296557
         Buffers: shared hit=416962 read=261547 written=3
         ->  Nested Loop  (cost=79.26..47364.49 rows=320000 width=12) (actual time=2.595..16358.651 rows=324320 loops=1)
               Buffers: shared hit=178800 read=160455 written=3
               ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=1.909..101.272 rows=4054 loops=1)
                     Buffers: shared hit=1856 read=12
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.021..0.035 rows=1 loops=1)
                           Filter: (n_name = 'CANADA'::bpchar)
                           Rows Removed by Filter: 24
                           Buffers: shared hit=1
                     ->  Bitmap Heap Scan on supplier  (cost=79.26..2350.26 rows=4000 width=8) (actual time=1.878..94.634 rows=4054 loops=1)
                           Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                           Buffers: shared hit=1855 read=12
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.472..1.472 rows=4054 loops=1)
                                 Index Cond: (s_nationkey = public.nation.n_nationkey)
                                 Buffers: shared hit=2 read=12
               ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.00..10.44 rows=80 width=16) (actual time=0.189..3.964 rows=80 loops=4054)
                     Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                     Buffers: shared hit=176944 read=160443 written=3
 Total runtime: 28103.693 ms
(46 rows)

COMMIT;
COMMIT