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 = 'MACHINERY'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-14'
	and l_shipdate > date '1995-03-14'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2779299.88..2779299.90 rows=10 width=20) (actual time=69353.506..69353.511 rows=10 loops=1)
   Buffers: shared hit=801024 read=573861 dirtied=887 written=891
   ->  Sort  (cost=2779299.88..2787291.79 rows=3196766 width=20) (actual time=69353.501..69353.504 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=801024 read=573861 dirtied=887 written=891
         ->  HashAggregate  (cost=2678251.25..2710218.91 rows=3196766 width=20) (actual time=69268.733..69334.591 rows=113427 loops=1)
               Buffers: shared hit=801018 read=573861 dirtied=887 written=891
               ->  Hash Join  (cost=632543.18..2630299.76 rows=3196766 width=20) (actual time=25713.610..68882.082 rows=299923 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=801018 read=573861 dirtied=887 written=891
                     ->  Seq Scan on lineitem  (cost=0.00..1842436.95 rows=32893858 width=12) (actual time=0.056..23364.319 rows=32390406 loops=1)
                           Filter: (l_shipdate > '1995-03-14'::date)
                           Rows Removed by Filter: 27654387
                           Buffers: shared hit=514219 read=567163 dirtied=887 written=887
                     ->  Hash  (cost=614047.95..614047.95 rows=1479619 width=12) (actual time=25711.369..25711.369 rows=1457792 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62640kB
                           Buffers: shared hit=286799 read=6698 written=4
                           ->  Hash Join  (cost=49660.32..614047.95 rows=1479619 width=12) (actual time=730.122..24908.697 rows=1457792 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=286799 read=6698 written=4
                                 ->  Seq Scan on orders  (cost=0.00..447376.99 rows=7433778 width=16) (actual time=0.034..6491.983 rows=7290640 loops=1)
                                       Filter: (o_orderdate < '1995-03-14'::date)
                                       Rows Removed by Filter: 7724360
                                       Buffers: shared hit=251523 read=5543 written=4
                                 ->  Hash  (cost=45928.32..45928.32 rows=298560 width=4) (actual time=729.812..729.812 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=35276 read=1155
                                       ->  Bitmap Heap Scan on customer  (cost=6918.32..45928.32 rows=298560 width=4) (actual time=137.432..588.053 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=35276 read=1155
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6843.68 rows=298560 width=0) (actual time=118.112..118.112 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 69390.675 ms
(35 rows)

COMMIT;
COMMIT