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=2694135.48..2694135.51 rows=10 width=20) (actual time=32680.090..32680.095 rows=10 loops=1)
   Buffers: shared hit=727077 read=642530 dirtied=103 written=1773
   ->  Sort  (cost=2694135.48..2702107.51 rows=3188811 width=20) (actual time=32680.086..32680.087 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=727077 read=642530 dirtied=103 written=1773
         ->  HashAggregate  (cost=2593338.31..2625226.42 rows=3188811 width=20) (actual time=32557.913..32659.003 rows=113021 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=727071 read=642530 dirtied=103 written=1773
               ->  Hash Join  (cost=556917.21..2545506.15 rows=3188811 width=20) (actual time=8490.682..32294.856 rows=297911 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=727071 read=642530 dirtied=103 written=1773
                     ->  Seq Scan on lineitem  (cost=0.00..1835182.91 rows=32404777 width=12) (actual time=0.069..18309.057 rows=31932887 loops=1)
                           Filter: (l_shipdate > '1995-03-31'::date)
                           Rows Removed by Filter: 28051939
                           Buffers: shared hit=484338 read=592782 written=4
                     ->  Hash  (cost=538263.27..538263.27 rows=1492315 width=12) (actual time=8478.506..8478.506 rows=1474128 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79726kB
                           Buffers: shared hit=242733 read=49748 dirtied=103 written=1769
                           ->  Hash Join  (cost=49712.62..538263.27 rows=1492315 width=12) (actual time=481.368..7966.903 rows=1474128 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=242733 read=49748 dirtied=103 written=1769
                                 ->  Seq Scan on orders  (cost=0.00..445615.79 rows=7469791 width=16) (actual time=0.034..4948.669 rows=7389217 loops=1)
                                       Filter: (o_orderdate < '1995-03-31'::date)
                                       Rows Removed by Filter: 7610783
                                       Buffers: shared hit=207458 read=48596 dirtied=103 written=1769
                                 ->  Hash  (cost=45966.74..45966.74 rows=299670 width=4) (actual time=477.744..477.744 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6942.87..45966.74 rows=299670 width=4) (actual time=75.643..388.139 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6867.95 rows=299670 width=0) (actual time=66.260..66.260 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.691 ms
 Execution time: 32713.049 ms
(38 rows)

COMMIT;
COMMIT