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 '1995-03-13'
	and l_shipdate > date '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2767668.53..2767668.55 rows=10 width=20) (actual time=61280.198..61280.203 rows=10 loops=1)
   Buffers: shared hit=1079609 read=290002 written=10
   ->  Sort  (cost=2767668.53..2775623.17 rows=3181859 width=20) (actual time=61280.193..61280.195 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=1079609 read=290002 written=10
         ->  HashAggregate  (cost=2667091.11..2698909.70 rows=3181859 width=20) (actual time=61190.283..61260.687 rows=113246 loops=1)
               Buffers: shared hit=1079603 read=290002 written=10
               ->  Hash Join  (cost=629559.43..2619363.22 rows=3181859 width=20) (actual time=22711.064..60877.104 rows=299441 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1079603 read=290002 written=10
                     ->  Seq Scan on lineitem  (cost=0.00..1835185.45 rows=32746600 width=12) (actual time=0.036..20403.018 rows=32382539 loops=1)
                           Filter: (l_shipdate > '1995-03-13'::date)
                           Rows Removed by Filter: 27602287
                           Buffers: shared hit=833087 read=244033
                     ->  Hash  (cost=611140.46..611140.46 rows=1473518 width=12) (actual time=22708.729..22708.729 rows=1454999 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62520kB
                           Buffers: shared hit=246516 read=45969 written=10
                           ->  Hash Join  (cost=49771.32..611140.46 rows=1473518 width=12) (actual time=709.776..21875.924 rows=1454999 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=246516 read=45969 written=10
                                 ->  Seq Scan on orders  (cost=0.00..445615.79 rows=7346776 width=16) (actual time=0.012..5179.364 rows=7277217 loops=1)
                                       Filter: (o_orderdate < '1995-03-13'::date)
                                       Rows Removed by Filter: 7722783
                                       Buffers: shared hit=246513 read=9541 written=10
                                 ->  Hash  (cost=46010.69..46010.69 rows=300850 width=4) (actual time=709.541..709.541 rows=300441 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10563kB
                                       Buffers: shared hit=3 read=36428
                                       ->  Bitmap Heap Scan on customer  (cost=6972.07..46010.69 rows=300850 width=4) (actual time=70.176..609.129 rows=300441 loops=1)
                                             Recheck Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                             Buffers: shared hit=3 read=36428
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6896.86 rows=300850 width=0) (actual time=60.997..60.997 rows=300441 loops=1)
                                                   Index Cond: (c_mktsegment = 'MACHINERY'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 61318.510 ms
(35 rows)

COMMIT;
COMMIT