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 '1995-03-15'
	and l_shipdate > date '1995-03-15'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2766326.19..2766326.22 rows=10 width=20) (actual time=59114.444..59114.448 rows=10 loops=1)
   Buffers: shared hit=979293 read=390315
   ->  Sort  (cost=2766326.19..2774233.10 rows=3162764 width=20) (actual time=59114.440..59114.442 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=979293 read=390315
         ->  HashAggregate  (cost=2666352.36..2697980.00 rows=3162764 width=20) (actual time=59046.367..59096.338 rows=112974 loops=1)
               Buffers: shared hit=979287 read=390315
               ->  Hash Join  (cost=629445.66..2618910.90 rows=3162764 width=20) (actual time=21461.981..58737.628 rows=298067 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=979287 read=390315
                     ->  Seq Scan on lineitem  (cost=0.00..1835185.45 rows=32707239 width=12) (actual time=0.045..18979.214 rows=32332476 loops=1)
                           Filter: (l_shipdate > '1995-03-15'::date)
                           Rows Removed by Filter: 27652350
                           Buffers: shared hit=698740 read=378380
                     ->  Hash  (cost=611115.19..611115.19 rows=1466438 width=12) (actual time=21460.448..21460.448 rows=1454250 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62488kB
                           Buffers: shared hit=280547 read=11935
                           ->  Hash Join  (cost=49678.57..611115.19 rows=1466438 width=12) (actual time=406.615..20430.910 rows=1454250 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=280547 read=11935
                                 ->  Seq Scan on orders  (cost=0.00..445615.79 rows=7356833 width=16) (actual time=0.013..5187.141 rows=7289727 loops=1)
                                       Filter: (o_orderdate < '1995-03-15'::date)
                                       Rows Removed by Filter: 7710273
                                       Buffers: shared hit=245387 read=10667
                                 ->  Hash  (cost=45941.13..45941.13 rows=298995 width=4) (actual time=406.444..406.444 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35160 read=1268
                                       ->  Bitmap Heap Scan on customer  (cost=6925.69..45941.13 rows=298995 width=4) (actual time=69.276..344.752 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Buffers: shared hit=35160 read=1268
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6850.94 rows=298995 width=0) (actual time=61.688..61.688 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 59151.143 ms
(35 rows)

COMMIT;
COMMIT