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=135989.21..136789.21 rows=320000 width=12) (actual time=3739.372..3740.538 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=516053 read=151451 written=581
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=49764.43..49764.44 rows=1 width=8) (actual time=723.736..723.736 rows=1 loops=1)
           Buffers: shared hit=333749 read=1
           ->  Nested Loop  (cost=79.26..47364.43 rows=320000 width=8) (actual time=0.958..664.384 rows=319040 loops=1)
                 Buffers: shared hit=333749 read=1
                 ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=0.941..7.874 rows=3988 loops=1)
                       Buffers: shared hit=1851
                       ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.008..0.012 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=0.926..6.952 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=0.648..0.648 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=0.009..0.150 rows=80 loops=3988)
                       Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                       Buffers: shared hit=331898 read=1
   ->  HashAggregate  (cost=52964.43..56964.43 rows=320000 width=12) (actual time=3589.661..3733.801 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=516050 read=151451 written=581
         ->  Nested Loop  (cost=79.26..47364.43 rows=320000 width=12) (actual time=1.369..2538.980 rows=319040 loops=1)
               Buffers: shared hit=182301 read=151450 written=581
               ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=1.303..31.207 rows=3988 loops=1)
                     Buffers: shared hit=406 read=1446 written=2
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.015..0.023 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=1.280..29.680 rows=3988 loops=1)
                           Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                           Buffers: shared hit=405 read=1446 written=2
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=0.981..0.981 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=0.027..0.606 rows=80 loops=3988)
                     Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                     Buffers: shared hit=181895 read=150004 written=579
 Total runtime: 3747.497 ms
(46 rows)

COMMIT;
COMMIT