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=130406.23..131205.80 rows=319827 width=12) (actual time=3657.777..3658.893 rows=9467 loops=1)
   Sort Key: (sum((partsupp.ps_supplycost * (partsupp.ps_availqty)::double precision)))
   Sort Method: quicksort  Memory: 828kB
   Buffers: shared hit=478132 read=189371 written=414
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=46983.42..46983.43 rows=1 width=8) (actual time=1001.085..1001.085 rows=1 loops=1)
           Buffers: shared hit=294385 read=39365 written=72
           ->  Nested Loop  (cost=79.73..44584.72 rows=319827 width=8) (actual time=1.107..938.577 rows=319040 loops=1)
                 Buffers: shared hit=294385 read=39365 written=72
                 ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=4) (actual time=1.076..7.486 rows=3988 loops=1)
                       Buffers: shared hit=1839 read=12
                       ->  Seq Scan on nation nation_1  (cost=0.00..1.31 rows=1 width=4) (actual time=0.009..0.014 rows=1 loops=1)
                             Filter: (n_name = 'CHINA'::bpchar)
                             Rows Removed by Filter: 24
                             Buffers: shared hit=1
                       ->  Bitmap Heap Scan on supplier supplier_1  (cost=79.29..2350.29 rows=4000 width=8) (actual time=1.060..6.578 rows=3988 loops=1)
                             Recheck Cond: (s_nationkey = nation_1.n_nationkey)
                             Heap Blocks: exact=1837
                             Buffers: shared hit=1838 read=12
                             ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.744..0.744 rows=3988 loops=1)
                                   Index Cond: (s_nationkey = nation_1.n_nationkey)
                                   Buffers: shared hit=1 read=12
                 ->  Index Scan using partsupp_ps_suppkey_idx on partsupp partsupp_1  (cost=0.43..9.75 rows=80 width=12) (actual time=0.015..0.218 rows=80 loops=3988)
                       Index Cond: (ps_suppkey = supplier_1.s_suppkey)
                       Buffers: shared hit=292546 read=39353 written=72
   ->  HashAggregate  (cost=50181.69..54179.53 rows=319827 width=12) (actual time=3566.670..3652.125 rows=9467 loops=1)
         Group Key: partsupp.ps_partkey
         Filter: (sum((partsupp.ps_supplycost * (partsupp.ps_availqty)::double precision)) > $2)
         Rows Removed by Filter: 290849
         Buffers: shared hit=478129 read=189371 written=414
         ->  Nested Loop  (cost=79.73..44584.72 rows=319827 width=12) (actual time=1.249..2311.465 rows=319040 loops=1)
               Buffers: shared hit=183744 read=150006 written=342
               ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=4) (actual time=1.191..14.670 rows=3988 loops=1)
                     Buffers: shared hit=1838 read=13
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.015..0.021 rows=1 loops=1)
                           Filter: (n_name = 'CHINA'::bpchar)
                           Rows Removed by Filter: 24
                           Buffers: shared hit=1
                     ->  Bitmap Heap Scan on supplier  (cost=79.29..2350.29 rows=4000 width=8) (actual time=1.166..13.389 rows=3988 loops=1)
                           Recheck Cond: (s_nationkey = nation.n_nationkey)
                           Heap Blocks: exact=1837
                           Buffers: shared hit=1837 read=13
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.875..0.875 rows=3988 loops=1)
                                 Index Cond: (s_nationkey = nation.n_nationkey)
                                 Buffers: shared read=13
               ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.43..9.75 rows=80 width=16) (actual time=0.024..0.554 rows=80 loops=3988)
                     Index Cond: (ps_suppkey = supplier.s_suppkey)
                     Buffers: shared hit=181906 read=149993 written=342
 Planning time: 3.366 ms
 Execution time: 3667.225 ms
(50 rows)

COMMIT;
COMMIT