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 = 'CHINA'
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 = 'CHINA'
		)
order by
	value desc;
                                                                                 QUERY PLAN                                                                                 
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=135989.56..136789.56 rows=320000 width=12) (actual time=5658.030..5659.194 rows=9467 loops=1)
   Sort Key: (sum((public.partsupp.ps_supplycost * (public.partsupp.ps_availqty)::double precision)))
   Sort Method: quicksort  Memory: 828kB
   Buffers: shared hit=518064 read=149440 written=2468
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=49764.61..49764.62 rows=1 width=8) (actual time=1127.877..1127.878 rows=1 loops=1)
           Buffers: shared hit=333738 read=12
           ->  Nested Loop  (cost=79.26..47364.61 rows=320000 width=8) (actual time=1.433..1024.134 rows=319040 loops=1)
                 Buffers: shared hit=333738 read=12
                 ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=1.410..12.002 rows=3988 loops=1)
                       Buffers: shared hit=1851
                       ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.013..0.019 rows=1 loops=1)
                             Filter: (n_name = 'CHINA'::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=1.389..10.614 rows=3988 loops=1)
                             Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                             Buffers: shared hit=1850
                             ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.031..1.031 rows=3988 loops=1)
                                   Index Cond: (s_nationkey = public.nation.n_nationkey)
                                   Buffers: shared hit=13
                 ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.00..10.44 rows=80 width=12) (actual time=0.014..0.227 rows=80 loops=3988)
                       Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                       Buffers: shared hit=331887 read=12
   ->  HashAggregate  (cost=52964.61..56964.61 rows=320000 width=12) (actual time=5502.879..5652.271 rows=9467 loops=1)
         Filter: (sum((public.partsupp.ps_supplycost * (public.partsupp.ps_availqty)::double precision)) > $2)
         Rows Removed by Filter: 290849
         Buffers: shared hit=518061 read=149440 written=2468
         ->  Nested Loop  (cost=79.26..47364.61 rows=320000 width=12) (actual time=1.533..3917.280 rows=319040 loops=1)
               Buffers: shared hit=184323 read=149428 written=2468
               ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=1.468..28.868 rows=3988 loops=1)
                     Buffers: shared hit=1836 read=16 written=7
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.018..0.027 rows=1 loops=1)
                           Filter: (n_name = 'CHINA'::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=1.440..26.558 rows=3988 loops=1)
                           Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                           Buffers: shared hit=1835 read=16 written=7
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.134..1.134 rows=3988 loops=1)
                                 Index Cond: (s_nationkey = public.nation.n_nationkey)
                                 Buffers: shared read=14 written=7
               ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.00..10.44 rows=80 width=16) (actual time=0.039..0.940 rows=80 loops=3988)
                     Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                     Buffers: shared hit=182487 read=149412 written=2461
 Total runtime: 5667.216 ms
(46 rows)

COMMIT;
COMMIT