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 '1995-03-17'
	and l_shipdate > date '1995-03-17'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2742172.75..2742172.77 rows=10 width=20) (actual time=68816.468..68816.472 rows=10 loops=1)
   Buffers: shared hit=612746 read=745009 dirtied=252 written=123
   ->  Sort  (cost=2742172.75..2750008.76 rows=3134406 width=20) (actual time=68816.465..68816.468 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=612746 read=745009 dirtied=252 written=123
         ->  HashAggregate  (cost=2643095.30..2674439.36 rows=3134406 width=20) (actual time=68737.228..68796.578 rows=113267 loops=1)
               Buffers: shared hit=612740 read=745009 dirtied=252 written=123
               ->  Hash Join  (cost=624558.08..2596079.21 rows=3134406 width=20) (actual time=26368.902..68388.149 rows=299117 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=612740 read=745009 dirtied=252 written=123
                     ->  Seq Scan on lineitem  (cost=0.00..1818873.36 rows=32347655 width=12) (actual time=1.037..21297.659 rows=32315744 loops=1)
                           Filter: (l_shipdate > '1995-03-17'::date)
                           Rows Removed by Filter: 27729859
                           Buffers: shared hit=529474 read=538072
                     ->  Hash  (cost=606353.51..606353.51 rows=1456366 width=12) (actual time=26366.136..26366.136 rows=1458134 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62655kB
                           Buffers: shared hit=83266 read=206937 dirtied=252 written=123
                           ->  Hash Join  (cost=49678.57..606353.51 rows=1456366 width=12) (actual time=477.399..25206.903 rows=1458134 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=83266 read=206937 dirtied=252 written=123
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7306304 width=16) (actual time=0.018..6324.491 rows=7309579 loops=1)
                                       Filter: (o_orderdate < '1995-03-17'::date)
                                       Rows Removed by Filter: 7705421
                                       Buffers: shared hit=47991 read=205784 dirtied=252 written=123
                                 ->  Hash  (cost=45941.13..45941.13 rows=298995 width=4) (actual time=477.204..477.204 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6925.69..45941.13 rows=298995 width=4) (actual time=75.861..391.390 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=35275 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6850.94 rows=298995 width=0) (actual time=66.321..66.321 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 68858.580 ms
(35 rows)

COMMIT;
COMMIT