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 = 'VIETNAM'
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 = 'VIETNAM'
		)
order by
	value desc;
                                                                                 QUERY PLAN                                                                                 
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=130429.93..131229.93 rows=320000 width=12) (actual time=2444.166..2445.395 rows=9650 loops=1)
   Sort Key: (sum((partsupp.ps_supplycost * (partsupp.ps_availqty)::double precision)))
   Sort Method: quicksort  Memory: 837kB
   Buffers: shared hit=660993 read=6382 written=309
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=46984.79..46984.80 rows=1 width=8) (actual time=749.258..749.258 rows=1 loops=1)
           Buffers: shared hit=331219 read=2467 written=118
           ->  Nested Loop  (cost=79.73..44584.79 rows=320000 width=8) (actual time=1.187..686.564 rows=318960 loops=1)
                 Buffers: shared hit=331219 read=2467 written=118
                 ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=4) (actual time=1.156..8.095 rows=3987 loops=1)
                       Buffers: shared hit=1846 read=13
                       ->  Seq Scan on nation nation_1  (cost=0.00..1.31 rows=1 width=4) (actual time=0.010..0.015 rows=1 loops=1)
                             Filter: (n_name = 'VIETNAM'::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=1.140..7.179 rows=3987 loops=1)
                             Recheck Cond: (s_nationkey = nation_1.n_nationkey)
                             Heap Blocks: exact=1845
                             Buffers: shared hit=1845 read=13
                             ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=0.816..0.816 rows=3987 loops=1)
                                   Index Cond: (s_nationkey = nation_1.n_nationkey)
                                   Buffers: shared read=13
                 ->  Index Scan using partsupp_ps_suppkey_idx on partsupp partsupp_1  (cost=0.43..9.75 rows=80 width=12) (actual time=0.016..0.154 rows=80 loops=3987)
                       Index Cond: (ps_suppkey = supplier_1.s_suppkey)
                       Buffers: shared hit=329373 read=2454 written=118
   ->  HashAggregate  (cost=50184.79..54184.79 rows=320000 width=12) (actual time=2322.720..2438.057 rows=9650 loops=1)
         Group Key: partsupp.ps_partkey
         Filter: (sum((partsupp.ps_supplycost * (partsupp.ps_availqty)::double precision)) > $2)
         Rows Removed by Filter: 291243
         Buffers: shared hit=660990 read=6382 written=309
         ->  Nested Loop  (cost=79.73..44584.79 rows=320000 width=12) (actual time=2.061..1323.341 rows=318960 loops=1)
               Buffers: shared hit=329771 read=3915 written=191
               ->  Nested Loop  (cost=79.29..2391.61 rows=4000 width=4) (actual time=1.980..15.451 rows=3987 loops=1)
                     Buffers: shared hit=1846 read=13 written=2
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.020..0.025 rows=1 loops=1)
                           Filter: (n_name = 'VIETNAM'::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=1.944..14.280 rows=3987 loops=1)
                           Recheck Cond: (s_nationkey = nation.n_nationkey)
                           Heap Blocks: exact=1845
                           Buffers: shared hit=1845 read=13 written=2
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.29 rows=4000 width=0) (actual time=1.548..1.548 rows=3987 loops=1)
                                 Index Cond: (s_nationkey = nation.n_nationkey)
                                 Buffers: shared read=13 written=2
               ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.43..9.75 rows=80 width=16) (actual time=0.025..0.307 rows=80 loops=3987)
                     Index Cond: (ps_suppkey = supplier.s_suppkey)
                     Buffers: shared hit=327925 read=3902 written=189
 Planning time: 3.428 ms
 Execution time: 2452.310 ms
(50 rows)

COMMIT;
COMMIT