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 = 'IRAQ'
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 = 'IRAQ'
		)
order by
	value desc;
                                                                                 QUERY PLAN                                                                                 
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=135989.60..136789.60 rows=320000 width=12) (actual time=8564.299..8565.734 rows=8406 loops=1)
   Sort Key: (sum((public.partsupp.ps_supplycost * (public.partsupp.ps_availqty)::double precision)))
   Sort Method: quicksort  Memory: 779kB
   Buffers: shared hit=512876 read=172538 written=521
   InitPlan 1 (returns $2)
     ->  Aggregate  (cost=49764.62..49764.64 rows=1 width=8) (actual time=2409.241..2409.242 rows=1 loops=1)
           Buffers: shared hit=318605 read=24100
           ->  Nested Loop  (cost=79.26..47364.62 rows=320000 width=8) (actual time=1.836..2274.349 rows=327600 loops=1)
                 Buffers: shared hit=318605 read=24100
                 ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=1.796..19.211 rows=4095 loops=1)
                       Buffers: shared hit=1837 read=13
                       ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.014..0.027 rows=1 loops=1)
                             Filter: (n_name = 'IRAQ'::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=1.772..17.326 rows=4095 loops=1)
                             Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                             Buffers: shared hit=1836 read=13
                             ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.387..1.387 rows=4095 loops=1)
                                   Index Cond: (s_nationkey = public.nation.n_nationkey)
                                   Buffers: shared read=13
                 ->  Index Scan using partsupp_ps_suppkey_idx on partsupp  (cost=0.00..10.44 rows=80 width=12) (actual time=0.034..0.521 rows=80 loops=4095)
                       Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                       Buffers: shared hit=316768 read=24087
   ->  HashAggregate  (cost=52964.62..56964.62 rows=320000 width=12) (actual time=8383.522..8557.829 rows=8406 loops=1)
         Filter: (sum((public.partsupp.ps_supplycost * (public.partsupp.ps_availqty)::double precision)) > $2)
         Rows Removed by Filter: 299658
         Buffers: shared hit=512873 read=172538 written=521
         ->  Nested Loop  (cost=79.26..47364.62 rows=320000 width=12) (actual time=2.119..5380.164 rows=327600 loops=1)
               Buffers: shared hit=194268 read=148438 written=521
               ->  Nested Loop  (cost=79.26..2391.58 rows=4000 width=4) (actual time=2.068..35.341 rows=4095 loops=1)
                     Buffers: shared hit=1832 read=19
                     ->  Seq Scan on nation  (cost=0.00..1.31 rows=1 width=4) (actual time=0.024..0.039 rows=1 loops=1)
                           Filter: (n_name = 'IRAQ'::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=2.032..32.094 rows=4095 loops=1)
                           Recheck Cond: (s_nationkey = public.nation.n_nationkey)
                           Buffers: shared hit=1831 read=19
                           ->  Bitmap Index Scan on supplier_s_nationkey_s_suppkey_idx  (cost=0.00..78.26 rows=4000 width=0) (actual time=1.640..1.640 rows=4095 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=0.052..1.266 rows=80 loops=4095)
                     Index Cond: (ps_suppkey = public.supplier.s_suppkey)
                     Buffers: shared hit=192436 read=148419 written=521
 Total runtime: 8573.912 ms
(46 rows)

COMMIT;
COMMIT