BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_orderkey,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	o_orderdate,
	o_shippriority
from
	customer,
	orders,
	lineitem
where
	c_mktsegment = 'BUILDING'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-09'
	and l_shipdate > date '1995-03-09'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2746390.94..2746390.97 rows=10 width=20) (actual time=85211.541..85211.546 rows=10 loops=1)
   Buffers: shared hit=960349 read=398725
   ->  Sort  (cost=2746390.94..2754293.98 rows=3161217 width=20) (actual time=85211.538..85211.542 rows=10 loops=1)
         Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))), orders.o_orderdate
         Sort Method: top-N heapsort  Memory: 25kB
         Buffers: shared hit=960349 read=398725
         ->  HashAggregate  (cost=2646466.01..2678078.18 rows=3161217 width=20) (actual time=85088.397..85184.313 rows=114181 loops=1)
               Buffers: shared hit=960343 read=398725
               ->  Hash Join  (cost=624689.28..2599047.75 rows=3161217 width=20) (actual time=28918.640..84534.398 rows=302494 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=960343 read=398725
                     ->  Seq Scan on lineitem  (cost=0.00..1820684.40 rows=32549841 width=12) (actual time=0.091..31763.184 rows=32515932 loops=1)
                           Filter: (l_shipdate > '1995-03-09'::date)
                           Rows Removed by Filter: 27529447
                           Buffers: shared hit=672900 read=395708
                     ->  Hash  (cost=606424.84..606424.84 rows=1461155 width=12) (actual time=28915.789..28915.789 rows=1455729 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62551kB
                           Buffers: shared hit=287443 read=3017
                           ->  Hash Join  (cost=49808.54..606424.84 rows=1461155 width=12) (actual time=895.482..26665.971 rows=1455729 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=287443 read=3017
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7266535 width=16) (actual time=0.025..6634.417 rows=7259473 loops=1)
                                       Filter: (o_orderdate < '1995-03-09'::date)
                                       Rows Removed by Filter: 7755527
                                       Buffers: shared hit=253104 read=924
                                 ->  Hash  (cost=46038.29..46038.29 rows=301620 width=4) (actual time=895.073..895.073 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=34339 read=2093
                                       ->  Bitmap Heap Scan on customer  (cost=6990.04..46038.29 rows=301620 width=4) (actual time=128.956..698.195 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=34339 read=2093
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6914.63 rows=301620 width=0) (actual time=115.060..115.060 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 85282.437 ms
(35 rows)

COMMIT;
COMMIT