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 = 'AMERICA'
	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=2446240.18..2446240.24 rows=25 width=34) (actual time=68251.320..68251.320 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=865889 read=621970
   ->  HashAggregate  (cost=2446239.35..2446239.60 rows=25 width=34) (actual time=68251.258..68251.260 rows=5 loops=1)
         Buffers: shared hit=865886 read=621970
         ->  Hash Join  (cost=402929.45..2445506.23 rows=73312 width=34) (actual time=11871.101..68136.427 rows=71949 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=865886 read=621970
               ->  Hash Join  (cost=398250.45..2403397.35 rows=1834838 width=46) (actual time=11794.745..64405.312 rows=1815880 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=863704 read=621970
                     ->  Seq Scan on lineitem  (cost=0.00..1683572.36 rows=60645236 width=16) (actual time=0.016..14314.693 rows=59984826 loops=1)
                           Buffers: shared hit=513237 read=563883
                     ->  Hash  (cost=392515.21..392515.21 rows=458819 width=38) (actual time=11794.111..11794.111 rows=453539 loops=1)
                           Buckets: 65536  Batches: 1  Memory Usage: 31890kB
                           Buffers: shared hit=350467 read=58087
                           ->  Hash Join  (cost=88858.70..392515.21 rows=458819 width=38) (actual time=2844.593..11553.149 rows=453539 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=350467 read=58087
                                 ->  Bitmap Heap Scan on orders  (cost=49816.48..340281.94 rows=2294097 width=8) (actual time=1585.916..4306.347 rows=2277049 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=240628 read=21987
                                       ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..49242.96 rows=2294097 width=0) (actual time=1465.846..1465.846 rows=2301704 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 read=6573
                                 ->  Hash  (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1258.086..1258.086 rows=299436 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 21055kB
                                       Buffers: shared hit=109839 read=36100
                                       ->  Nested Loop  (cost=905.09..35292.22 rows=300000 width=38) (actual time=21.318..1117.248 rows=299436 loops=1)
                                             Buffers: shared hit=109839 read=36100
                                             ->  Nested Loop  (cost=0.00..14.07 rows=5 width=30) (actual time=0.061..0.136 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=0.019..0.051 rows=25 loops=1)
                                                         Buffers: shared hit=2
                                                   ->  Materialize  (cost=0.00..1.07 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=25)
                                                         Buffers: shared hit=1
                                                         ->  Seq Scan on region  (cost=0.00..1.06 rows=1 width=4) (actual time=0.024..0.024 rows=1 loops=1)
                                                               Filter: (r_name = 'AMERICA'::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=22.184..207.458 rows=59887 loops=5)
                                                   Recheck Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=109836 read=36100
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0) (actual time=14.896..14.896 rows=59887 loops=5)
                                                         Index Cond: (c_nationkey = nation.n_nationkey)
                                                         Buffers: shared hit=7 read=827
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=75.658..75.658 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=0.011..49.015 rows=100000 loops=1)
                           Buffers: shared hit=2179
 Total runtime: 68264.699 ms
(55 rows)

COMMIT;
COMMIT