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 '1995-03-24'
	and l_shipdate > date '1995-03-24'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2688670.85..2688670.88 rows=10 width=20) (actual time=30019.316..30019.320 rows=10 loops=1)
   Buffers: shared hit=706748 read=660209
   ->  Sort  (cost=2688670.85..2696616.09 rows=3178096 width=20) (actual time=30019.312..30019.313 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=706748 read=660209
         ->  HashAggregate  (cost=2588212.38..2619993.34 rows=3178096 width=20) (actual time=29960.717..30000.300 rows=113020 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=706742 read=660209
               ->  Hash Join  (cost=555606.44..2540540.94 rows=3178096 width=20) (actual time=8015.367..29727.248 rows=298217 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=706742 read=660209
                     ->  Seq Scan on lineitem  (cost=0.00..1831531.51 rows=32432541 width=12) (actual time=0.065..16798.034 rows=32106780 loops=1)
                           Filter: (l_shipdate > '1995-03-24'::date)
                           Rows Removed by Filter: 27877142
                           Buffers: shared hit=548516 read=526460
                     ->  Hash  (cost=537067.80..537067.80 rows=1483091 width=12) (actual time=8003.740..8003.740 rows=1465377 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79350kB
                           Buffers: shared hit=158226 read=133749
                           ->  Hash Join  (cost=49764.48..537067.80 rows=1483091 width=12) (actual time=697.912..7465.565 rows=1465377 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=158226 read=133749
                                 ->  Seq Scan on orders  (cost=0.00..444735.19 rows=7396593 width=16) (actual time=0.030..4563.852 rows=7346132 loops=1)
                                       Filter: (o_orderdate < '1995-03-24'::date)
                                       Rows Removed by Filter: 7653868
                                       Buffers: shared hit=158224 read=97324
                                 ->  Hash  (cost=46004.92..46004.92 rows=300765 width=4) (actual time=695.124..695.124 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6967.36..46004.92 rows=300765 width=4) (actual time=64.077..608.825 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6892.16 rows=300765 width=0) (actual time=56.168..56.168 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.933 ms
 Execution time: 30051.615 ms
(38 rows)

COMMIT;
COMMIT