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 '1996-01-01'
	and o_orderdate < date '1996-01-01' + interval '1 year'
group by
	n_name
order by
	revenue desc;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=2439964.10..2439964.16 rows=25 width=34) (actual time=153662.987..153662.987 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=780611 read=703465 written=6
   ->  HashAggregate  (cost=2439963.27..2439963.52 rows=25 width=34) (actual time=153662.899..153662.901 rows=5 loops=1)
         Buffers: shared hit=780608 read=703465 written=6
         ->  Hash Join  (cost=402391.17..2439227.10 rows=73617 width=34) (actual time=29293.896..153332.310 rows=72751 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=780608 read=703465 written=6
               ->  Hash Join  (cost=397712.17..2396997.31 rows=1840731 width=46) (actual time=29111.784..147939.611 rows=1826305 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=778426 read=703465 written=6
                     ->  Seq Scan on lineitem  (cost=0.00..1678557.89 rows=60463989 width=16) (actual time=0.027..65601.552 rows=60044664 loops=1)
                           Buffers: shared hit=418265 read=655653 written=6
                     ->  Hash  (cost=391958.37..391958.37 rows=460304 width=38) (actual time=29111.110..29111.110 rows=456553 loops=1)
                           Buckets: 65536  Batches: 1  Memory Usage: 32102kB
                           Buffers: shared hit=360161 read=47812
                           ->  Hash Join  (cost=88906.79..391958.37 rows=460304 width=38) (actual time=8863.802..28672.586 rows=456553 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=360161 read=47812
                                 ->  Bitmap Heap Scan on orders  (cost=49864.58..339682.41 rows=2301522 width=8) (actual time=2451.744..14135.068 rows=2283996 loops=1)
                                       Recheck Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone))
                                       Buffers: shared hit=247654 read=14162
                                       ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..49289.20 rows=2301522 width=0) (actual time=2307.783..2307.783 rows=2299883 loops=1)
                                             Index Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone))
                                             Buffers: shared read=6538
                                 ->  Hash  (cost=35292.22..35292.22 rows=300000 width=38) (actual time=6411.667..6411.667 rows=299838 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 21083kB
                                       Buffers: shared hit=112507 read=33650
                                       ->  Nested Loop  (cost=905.09..35292.22 rows=300000 width=38) (actual time=63.399..6162.193 rows=299838 loops=1)
                                             Buffers: shared hit=112507 read=33650
                                             ->  Nested Loop  (cost=0.00..14.07 rows=5 width=30) (actual time=0.084..0.212 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=0.017..0.069 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=0.036..0.036 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=48.473..1206.498 rows=59968 loops=5)
                                                   Recheck Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=112504 read=33650
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0) (actual time=39.162..39.162 rows=59968 loops=5)
                                                         Index Cond: (c_nationkey = nation.n_nationkey)
                                                         Buffers: shared hit=5 read=832
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=180.665..180.665 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=0.013..128.063 rows=100000 loops=1)
                           Buffers: shared hit=2179
 Total runtime: 153685.987 ms
(55 rows)

COMMIT;
COMMIT