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 '1995-03-10'
	and l_shipdate > date '1995-03-10'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698809.94..2698809.96 rows=10 width=20) (actual time=33777.136..33777.140 rows=10 loops=1)
   Buffers: shared hit=687397 read=684858 dirtied=970 written=631
   ->  Sort  (cost=2698809.94..2706746.68 rows=3174696 width=20) (actual time=33777.133..33777.134 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=687397 read=684858 dirtied=970 written=631
         ->  HashAggregate  (cost=2598458.94..2630205.90 rows=3174696 width=20) (actual time=33711.781..33757.301 rows=113118 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=687391 read=684858 dirtied=970 written=631
               ->  Hash Join  (cost=556607.55..2550838.50 rows=3174696 width=20) (actual time=9353.477..33469.664 rows=298577 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=687391 read=684858 dirtied=970 written=631
                     ->  Seq Scan on lineitem  (cost=0.00..1838827.16 rows=32975153 width=12) (actual time=0.032..17868.890 rows=32489962 loops=1)
                           Filter: (l_shipdate > '1995-03-10'::date)
                           Rows Removed by Filter: 27555335
                           Buffers: shared hit=562246 read=517016 dirtied=959 written=379
                     ->  Hash  (cost=538321.35..538321.35 rows=1462896 width=12) (actual time=9342.470..9342.470 rows=1449337 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78661kB
                           Buffers: shared hit=125145 read=167842 dirtied=11 written=252
                           ->  Hash Join  (cost=49686.93..538321.35 rows=1462896 width=12) (actual time=756.207..8792.037 rows=1449337 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=125145 read=167842 dirtied=11 written=252
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7335752 width=16) (actual time=0.020..5019.941 rows=7265841 loops=1)
                                       Filter: (o_orderdate < '1995-03-10'::date)
                                       Rows Removed by Filter: 7749159
                                       Buffers: shared hit=125143 read=131417 dirtied=11 written=161
                                 ->  Hash  (cost=45947.81..45947.81 rows=299130 width=4) (actual time=753.430..753.430 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=2 read=36425 written=91
                                       ->  Bitmap Heap Scan on customer  (cost=6930.69..45947.81 rows=299130 width=4) (actual time=70.637..657.303 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425 written=91
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6855.90 rows=299130 width=0) (actual time=61.986..61.986 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 3.837 ms
 Execution time: 33801.521 ms
(38 rows)

COMMIT;
COMMIT