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 = 'EUROPE'
	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=2436410.77..2436410.83 rows=25 width=34) (actual time=141767.508..141767.508 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=999034 read=483662 written=1
   ->  HashAggregate  (cost=2436409.94..2436410.19 rows=25 width=34) (actual time=141767.419..141767.421 rows=5 loops=1)
         Buffers: shared hit=999031 read=483662 written=1
         ->  Hash Join  (cost=401162.84..2435678.53 rows=73141 width=34) (actual time=23238.102..141456.190 rows=72786 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=999031 read=483662 written=1
               ->  Hash Join  (cost=396483.84..2393691.22 rows=1828845 width=46) (actual time=23124.607..136637.524 rows=1829012 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=996849 read=483662 written=1
                     ->  Seq Scan on lineitem  (cost=0.00..1676897.96 rows=60404196 width=16) (actual time=0.027..61540.258 rows=60045310 loops=1)
                           Buffers: shared hit=596549 read=476307 written=1
                     ->  Hash  (cost=390767.22..390767.22 rows=457329 width=38) (actual time=23123.925..23123.925 rows=457418 loops=1)
                           Buckets: 65536  Batches: 1  Memory Usage: 32163kB
                           Buffers: shared hit=400300 read=7355
                           ->  Hash Join  (cost=88278.30..390767.22 rows=457329 width=38) (actual time=3757.093..22706.329 rows=457418 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=400300 read=7355
                                 ->  Bitmap Heap Scan on orders  (cost=49236.09..338576.79 rows=2286647 width=8) (actual time=1762.560..13469.684 rows=2279082 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=254957 read=6520
                                       ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..48664.42 rows=2286647 width=0) (actual time=1642.739..1642.739 rows=2292541 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=6448
                                 ->  Hash  (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1994.090..1994.090 rows=300963 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 21162kB
                                       Buffers: shared hit=145343 read=835
                                       ->  Nested Loop  (cost=905.09..35292.22 rows=300000 width=38) (actual time=23.912..1782.528 rows=300963 loops=1)
                                             Buffers: shared hit=145343 read=835
                                             ->  Nested Loop  (cost=0.00..14.07 rows=5 width=30) (actual time=0.063..0.183 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=0.012..0.071 rows=25 loops=1)
                                                         Buffers: shared hit=2
                                                   ->  Materialize  (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..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=0.030..0.030 rows=1 loops=1)
                                                               Filter: (r_name = 'EUROPE'::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=31.305..333.793 rows=60193 loops=5)
                                                   Recheck Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=145340 read=835
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0) (actual time=22.184..22.184 rows=60193 loops=5)
                                                         Index Cond: (c_nationkey = nation.n_nationkey)
                                                         Buffers: shared hit=6 read=833
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=112.723..112.723 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=0.015..75.354 rows=100000 loops=1)
                           Buffers: shared hit=2179
 Total runtime: 141786.013 ms
(55 rows)

COMMIT;
COMMIT