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 '1995-03-14'
	and l_shipdate > date '1995-03-14'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2757731.30..2757731.32 rows=10 width=20) (actual time=81700.783..81700.788 rows=10 loops=1)
   Buffers: shared hit=864312 read=501339 dirtied=1 written=3
   ->  Sort  (cost=2757731.30..2765597.26 rows=3146387 width=20) (actual time=81700.778..81700.781 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=864312 read=501339 dirtied=1 written=3
         ->  HashAggregate  (cost=2658275.13..2689739.00 rows=3146387 width=20) (actual time=81591.759..81675.303 rows=114146 loops=1)
               Buffers: shared hit=864306 read=501339 dirtied=1 written=3
               ->  Hash Join  (cost=627643.97..2611079.33 rows=3146387 width=20) (actual time=26421.625..81108.381 rows=302411 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=864306 read=501339 dirtied=1 written=3
                     ->  Seq Scan on lineitem  (cost=0.00..1829724.26 rows=32599259 width=12) (actual time=0.065..31275.760 rows=32389697 loops=1)
                           Filter: (l_shipdate > '1995-03-14'::date)
                           Rows Removed by Filter: 27654967
                           Buffers: shared hit=610576 read=463342
                     ->  Hash  (cost=609402.25..609402.25 rows=1459338 width=12) (actual time=26418.805..26418.805 rows=1461938 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62818kB
                           Buffers: shared hit=253730 read=37997 dirtied=1 written=3
                           ->  Hash Join  (cost=49651.57..609402.25 rows=1459338 width=12) (actual time=1451.803..25391.869 rows=1461938 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=253730 read=37997 dirtied=1 written=3
                                 ->  Seq Scan on orders  (cost=0.00..444294.89 rows=7335448 width=16) (actual time=0.034..6673.924 rows=7290745 loops=1)
                                       Filter: (o_orderdate < '1995-03-14'::date)
                                       Rows Removed by Filter: 7724255
                                       Buffers: shared hit=253728 read=1567 dirtied=1 written=3
                                 ->  Hash  (cost=45921.38..45921.38 rows=298415 width=4) (actual time=1451.219..1451.219 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=2 read=36430
                                       ->  Bitmap Heap Scan on customer  (cost=6913.20..45921.38 rows=298415 width=4) (actual time=146.264..1275.279 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=2 read=36430
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6838.59 rows=298415 width=0) (actual time=127.544..127.544 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 81749.279 ms
(35 rows)

COMMIT;
COMMIT