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=135989.33..136789.33 rows=320000 width=12) (actual time=12403.235..12404.530 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=663109 read=4395 written=289
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=49764.49..49764.50 rows=1 width=8) (actual time=4827.006..4827.007 rows=1 loops=1)
           Buffers: shared hit=333730 read=20 written=1
           ->  Nested Loop  (cost=79.26..47364.49 rows=320000 width=8) (actual time=3.801..4698.056 rows=319040 loops=1)
                 Buffers: shared hit=333730 read=20 written=1
                 ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=1.644..55.068 rows=3988 loops=1)
                       Buffers: shared hit=1851
                       ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.016..0.024 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=1.615..52.068 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=1.281..1.281 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=0.074..1.134 rows=80 loops=3988)
                       Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                       Buffers: shared hit=331879 read=20 written=1
   ->  HashAggregate  (cost=52964.49..56964.49 rows=320000 width=12) (actual time=12262.282..12397.332 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=663106 read=4395 written=289
         ->  Nested Loop  (cost=79.26..47364.49 rows=320000 width=12) (actual time=3.543..6855.642 rows=319040 loops=1)
               Buffers: shared hit=329376 read=4375 written=288
               ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=3.473..89.071 rows=3988 loops=1)
                     Buffers: shared hit=1838 read=14
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.017..0.030 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=3.445..85.203 rows=3988 loops=1)
                           Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                           Buffers: shared hit=1837 read=14
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=3.064..3.064 rows=3988 loops=1)
                                 Index Cond: (s_nationkey = public.nation.n_nationkey)
                                 Buffers: shared read=14
               ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.00..10.44 rows=80 width=16) (actual time=0.126..1.655 rows=80 loops=3988)
                     Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                     Buffers: shared hit=327538 read=4361 written=288
 Total runtime: 12413.054 ms
(46 rows)

COMMIT;
COMMIT