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 '1995-03-05'
	and l_shipdate > date '1995-03-05'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2683300.58..2683300.61 rows=10 width=20) (actual time=32627.106..32627.110 rows=10 loops=1)
   Buffers: shared hit=916656 read=447674 dirtied=32 written=147
   ->  Sort  (cost=2683300.58..2691192.81 rows=3156890 width=20) (actual time=32627.102..32627.103 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=916656 read=447674 dirtied=32 written=147
         ->  HashAggregate  (cost=2583512.42..2615081.32 rows=3156890 width=20) (actual time=32560.847..32607.020 rows=113055 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=916650 read=447674 dirtied=32 written=147
               ->  Hash Join  (cost=553497.07..2536159.07 rows=3156890 width=20) (actual time=8884.129..32308.059 rows=298590 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=916650 read=447674 dirtied=32 written=147
                     ->  Seq Scan on lineitem  (cost=0.00..1827919.27 rows=32846353 width=12) (actual time=0.032..17959.349 rows=32615583 loops=1)
                           Filter: (l_shipdate > '1995-03-05'::date)
                           Rows Removed by Filter: 27429727
                           Buffers: shared hit=716251 read=356605 dirtied=32 written=31
                     ->  Hash  (cost=535350.21..535350.21 rows=1451749 width=12) (actual time=8867.876..8867.876 rows=1443180 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78396kB
                           Buffers: shared hit=200399 read=91069 written=116
                           ->  Hash Join  (cost=49696.83..535350.21 rows=1451749 width=12) (actual time=837.414..8315.175 rows=1443180 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=200399 read=91069 written=116
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7275478 width=16) (actual time=0.042..4926.291 rows=7234321 loops=1)
                                       Filter: (o_orderdate < '1995-03-05'::date)
                                       Rows Removed by Filter: 7780679
                                       Buffers: shared hit=200396 read=54645 written=40
                                 ->  Hash  (cost=45955.46..45955.46 rows=299310 width=4) (actual time=833.880..833.880 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=3 read=36424 written=76
                                       ->  Bitmap Heap Scan on customer  (cost=6936.08..45955.46 rows=299310 width=4) (actual time=82.358..734.050 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=3 read=36424 written=76
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6861.25 rows=299310 width=0) (actual time=72.534..72.534 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152 written=6
 Planning time: 4.586 ms
 Execution time: 32668.265 ms
(38 rows)

COMMIT;
COMMIT