BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	n_name,
	sum(l_extendedprice * (1 - l_discount)) as revenue
from
	customer,
	orders,
	lineitem,
	supplier,
	nation,
	region
where
	c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and l_suppkey = s_suppkey
	and c_nationkey = s_nationkey
	and s_nationkey = n_nationkey
	and n_regionkey = r_regionkey
	and r_name = 'MIDDLE EAST'
	and o_orderdate >= date '1993-01-01'
	and o_orderdate < date '1993-01-01' + interval '1 year'
group by
	n_name
order by
	revenue desc;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=2443691.61..2443691.67 rows=25 width=34) (actual time=99557.652..99557.653 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=824973 read=661769 written=2
   ->  HashAggregate  (cost=2443690.78..2443691.03 rows=25 width=34) (actual time=99557.551..99557.560 rows=5 loops=1)
         Buffers: shared hit=824970 read=661769 written=2
         ->  Hash Join  (cost=402476.29..2442958.26 rows=73252 width=34) (actual time=18321.144..99326.433 rows=73652 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=824970 read=661769 written=2
               ->  Hash Join  (cost=397797.29..2400921.32 rows=1831271 width=46) (actual time=18164.014..94996.572 rows=1823744 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=822788 read=661769 written=2
                     ->  Seq Scan on lineitem  (cost=0.00..1681889.54 rows=60584354 width=16) (actual time=0.019..30678.954 rows=60044176 loops=1)
                           Buffers: shared hit=501433 read=574613
                     ->  Hash  (cost=392073.10..392073.10 rows=457935 width=38) (actual time=18163.477..18163.477 rows=455938 loops=1)
                           Buckets: 65536  Batches: 1  Memory Usage: 32059kB
                           Buffers: shared hit=321355 read=87156 written=2
                           ->  Hash Join  (cost=88761.36..392073.10 rows=457935 width=38) (actual time=4339.109..17729.461 rows=455938 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=321355 read=87156 written=2
                                 ->  Bitmap Heap Scan on orders  (cost=49719.15..339865.26 rows=2289674 width=8) (actual time=1861.069..8226.590 rows=2279336 loops=1)
                                       Recheck Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone))
                                       Buffers: shared hit=192021 read=70333 written=2
                                       ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..49146.73 rows=2289674 width=0) (actual time=1751.927..1751.927 rows=2299442 loops=1)
                                             Index Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone))
                                             Buffers: shared hit=2 read=6563
                                 ->  Hash  (cost=35292.22..35292.22 rows=300000 width=38) (actual time=2477.731..2477.731 rows=299838 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 21083kB
                                       Buffers: shared hit=129334 read=16823
                                       ->  Nested Loop  (cost=905.09..35292.22 rows=300000 width=38) (actual time=42.874..2243.201 rows=299838 loops=1)
                                             Buffers: shared hit=129334 read=16823
                                             ->  Nested Loop  (cost=0.00..14.07 rows=5 width=30) (actual time=0.078..0.196 rows=5 loops=1)
                                                   Join Filter: (nation.n_regionkey = region.r_regionkey)
                                                   Rows Removed by Join Filter: 20
                                                   Buffers: shared hit=3
                                                   ->  Index Scan using pk_nation on nation  (cost=0.00..12.63 rows=25 width=34) (actual time=0.015..0.061 rows=25 loops=1)
                                                         Buffers: shared hit=2
                                                   ->  Materialize  (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=25)
                                                         Buffers: shared hit=1
                                                         ->  Seq Scan on region  (cost=0.00..1.06 rows=1 width=4) (actual time=0.033..0.033 rows=1 loops=1)
                                                               Filter: (r_name = 'MIDDLE EAST'::bpchar)
                                                               Rows Removed by Filter: 4
                                                               Buffers: shared hit=1
                                             ->  Bitmap Heap Scan on customer  (cost=905.09..6455.63 rows=60000 width=8) (actual time=35.958..422.356 rows=59968 loops=5)
                                                   Recheck Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=129331 read=16823
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0) (actual time=26.412..26.412 rows=59968 loops=5)
                                                         Index Cond: (c_nationkey = nation.n_nationkey)
                                                         Buffers: shared hit=11 read=826
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=155.500..155.500 rows=100000 loops=1)
                     Buckets: 16384  Batches: 1  Memory Usage: 3907kB
                     Buffers: shared hit=2179
                     ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.008..109.163 rows=100000 loops=1)
                           Buffers: shared hit=2179
 Total runtime: 99568.052 ms
(55 rows)

COMMIT;
COMMIT