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 '1995-03-16'
	and l_shipdate > date '1995-03-16'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2746420.01..2746420.03 rows=10 width=20) (actual time=77537.863..77537.869 rows=10 loops=1)
   Buffers: shared hit=599774 read=757981 dirtied=252 written=5
   ->  Sort  (cost=2746420.01..2754379.73 rows=3183891 width=20) (actual time=77537.858..77537.863 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=599774 read=757981 dirtied=252 written=5
         ->  HashAggregate  (cost=2645778.36..2677617.27 rows=3183891 width=20) (actual time=77397.451..77506.693 rows=113160 loops=1)
               Buffers: shared hit=599768 read=757981 dirtied=252 written=5
               ->  Hash Join  (cost=625763.37..2598019.99 rows=3183891 width=20) (actual time=29525.992..76996.868 rows=298606 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=599768 read=757981 dirtied=252 written=5
                     ->  Seq Scan on lineitem  (cost=0.00..1818863.45 rows=32414470 width=12) (actual time=0.062..25038.075 rows=32340889 loops=1)
                           Filter: (l_shipdate > '1995-03-16'::date)
                           Rows Removed by Filter: 27704714
                           Buffers: shared hit=508478 read=559068 written=3
                     ->  Hash  (cost=607309.51..607309.51 rows=1476309 width=12) (actual time=29523.475..29523.475 rows=1456776 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62596kB
                           Buffers: shared hit=91290 read=198913 dirtied=252 written=2
                           ->  Hash Join  (cost=49784.82..607309.51 rows=1476309 width=12) (actual time=706.328..25618.323 rows=1456776 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=91290 read=198913 dirtied=252 written=2
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7353600 width=16) (actual time=0.017..6969.087 rows=7303203 loops=1)
                                       Filter: (o_orderdate < '1995-03-16'::date)
                                       Rows Removed by Filter: 7711797
                                       Buffers: shared hit=56015 read=197760 dirtied=252 written=2
                                 ->  Hash  (cost=46020.57..46020.57 rows=301140 width=4) (actual time=706.058..706.058 rows=299751 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10539kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6978.32..46020.57 rows=301140 width=4) (actual time=112.061..563.314 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..6903.03 rows=301140 width=0) (actual time=99.884..99.884 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 77583.767 ms
(35 rows)

COMMIT;
COMMIT