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 '1995-03-07'
	and l_shipdate > date '1995-03-07'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2748351.44..2748351.46 rows=10 width=20) (actual time=93847.189..93847.195 rows=10 loops=1)
   Buffers: shared hit=923788 read=436593 dirtied=252 written=2
   ->  Sort  (cost=2748351.44..2756237.07 rows=3154254 width=20) (actual time=93847.185..93847.189 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=923788 read=436593 dirtied=252 written=2
         ->  HashAggregate  (cost=2648646.60..2680189.14 rows=3154254 width=20) (actual time=93713.462..93811.875 rows=113137 loops=1)
               Buffers: shared hit=923782 read=436593 dirtied=252 written=2
               ->  Hash Join  (cost=624880.77..2601332.79 rows=3154254 width=20) (actual time=30591.316..92844.174 rows=298880 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=923782 read=436593 dirtied=252 written=2
                     ->  Seq Scan on lineitem  (cost=0.00..1822480.27 rows=32647787 width=12) (actual time=0.100..36123.747 rows=32565911 loops=1)
                           Filter: (l_shipdate > '1995-03-07'::date)
                           Rows Removed by Filter: 27479392
                           Buffers: shared hit=665227 read=404439 written=2
                     ->  Hash  (cost=606693.15..606693.15 rows=1455010 width=12) (actual time=30589.169..30589.169 rows=1445611 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62117kB
                           Buffers: shared hit=258555 read=32154 dirtied=252
                           ->  Hash Join  (cost=49752.35..606693.15 rows=1455010 width=12) (actual time=1807.719..29617.259 rows=1445611 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=258555 read=32154 dirtied=252
                                 ->  Seq Scan on orders  (cost=0.00..442530.20 rows=7262582 width=16) (actual time=0.019..8531.073 rows=7246928 loops=1)
                                       Filter: (o_orderdate < '1995-03-07'::date)
                                       Rows Removed by Filter: 7768072
                                       Buffers: shared hit=238802 read=15479 dirtied=252
                                 ->  Hash  (cost=45995.91..45995.91 rows=300515 width=4) (actual time=1807.484..1807.484 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=19753 read=16675
                                       ->  Bitmap Heap Scan on customer  (cost=6961.47..45995.91 rows=300515 width=4) (actual time=174.246..1626.343 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=19753 read=16675
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6886.34 rows=300515 width=0) (actual time=163.437..163.437 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 93906.253 ms
(35 rows)

COMMIT;
COMMIT