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 '1995-03-31'
	and l_shipdate > date '1995-03-31'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2672327.39..2672327.42 rows=10 width=20) (actual time=35022.099..35022.104 rows=10 loops=1)
   Buffers: shared hit=822725 read=535891 written=1942
   ->  Sort  (cost=2672327.39..2680244.54 rows=3166858 width=20) (actual time=35022.096..35022.099 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=822725 read=535891 written=1942
         ->  HashAggregate  (cost=2572224.15..2603892.73 rows=3166858 width=20) (actual time=34918.447..35001.433 rows=113059 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=822719 read=535891 written=1942
               ->  Hash Join  (cost=552711.60..2524721.28 rows=3166858 width=20) (actual time=9999.112..34627.243 rows=298135 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=822719 read=535891 written=1942
                     ->  Seq Scan on lineitem  (cost=0.00..1820341.29 rows=31999950 width=12) (actual time=0.049..18437.546 rows=31933966 loops=1)
                           Filter: (l_shipdate > '1995-03-31'::date)
                           Rows Removed by Filter: 28051586
                           Buffers: shared hit=575663 read=492745
                     ->  Hash  (cost=534118.69..534118.69 rows=1487433 width=12) (actual time=9979.307..9979.307 rows=1474034 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79722kB
                           Buffers: shared hit=247056 read=43146 written=1942
                           ->  Hash Join  (cost=49751.80..534118.69 rows=1487433 width=12) (actual time=903.537..9310.851 rows=1474034 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=247056 read=43146 written=1942
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7424788 width=16) (actual time=0.023..4742.968 rows=7389038 loops=1)
                                       Filter: (o_orderdate < '1995-03-31'::date)
                                       Rows Removed by Filter: 7610962
                                       Buffers: shared hit=247054 read=6721 written=343
                                 ->  Hash  (cost=45995.55..45995.55 rows=300500 width=4) (actual time=899.174..899.174 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425 written=1599
                                       ->  Bitmap Heap Scan on customer  (cost=6961.30..45995.55 rows=300500 width=4) (actual time=80.892..775.736 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=1599
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6886.18 rows=300500 width=0) (actual time=71.961..71.961 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152 written=38
 Planning time: 4.001 ms
 Execution time: 35058.669 ms
(38 rows)

COMMIT;
COMMIT