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 = 'HOUSEHOLD'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-27'
	and l_shipdate > date '1995-03-27'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2764629.81..2764629.84 rows=10 width=20) (actual time=86154.601..86154.604 rows=10 loops=1)
   Buffers: shared hit=1003035 read=363923 dirtied=27 written=1
   ->  Sort  (cost=2764629.81..2772633.34 rows=3201410 width=20) (actual time=86154.596..86154.598 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=1003035 read=363923 dirtied=27 written=1
         ->  HashAggregate  (cost=2663434.39..2695448.49 rows=3201410 width=20) (actual time=86065.007..86135.603 rows=113040 loops=1)
               Buffers: shared hit=1003029 read=363923 dirtied=27 written=1
               ->  Hash Join  (cost=630408.93..2615413.24 rows=3201410 width=20) (actual time=30260.384..85548.571 rows=298085 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1003029 read=363923 dirtied=27 written=1
                     ->  Seq Scan on lineitem  (cost=0.00..1831526.36 rows=32390359 width=12) (actual time=0.056..34630.994 rows=32031708 loops=1)
                           Filter: (l_shipdate > '1995-03-27'::date)
                           Rows Removed by Filter: 27952214
                           Buffers: shared hit=749047 read=325929
                     ->  Hash  (cost=611709.98..611709.98 rows=1495916 width=12) (actual time=30257.815..30257.815 rows=1469132 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63127kB
                           Buffers: shared hit=253982 read=37994 dirtied=27 written=1
                           ->  Hash Join  (cost=49822.03..611709.98 rows=1495916 width=12) (actual time=1254.670..29369.132 rows=1469132 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=253982 read=37994 dirtied=27 written=1
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7432262 width=16) (actual time=0.020..9349.563 rows=7364711 loops=1)
                                       Filter: (o_orderdate < '1995-03-27'::date)
                                       Rows Removed by Filter: 7635289
                                       Buffers: shared hit=253979 read=1569 dirtied=27 written=1
                                 ->  Hash  (cost=46048.16..46048.16 rows=301910 width=4) (actual time=1254.176..1254.176 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=3 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6996.28..46048.16 rows=301910 width=4) (actual time=111.732..1085.414 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=3 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6920.81 rows=301910 width=0) (actual time=99.390..99.390 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 86192.982 ms
(35 rows)

COMMIT;
COMMIT