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 = 'AUTOMOBILE'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-12'
	and l_shipdate > date '1995-03-12'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2745467.24..2745467.27 rows=10 width=20) (actual time=109885.814..109885.817 rows=10 loops=1)
   Buffers: shared hit=990959 read=368111 written=538
   ->  Sort  (cost=2745467.24..2753326.66 rows=3143767 width=20) (actual time=109885.811..109885.812 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=990959 read=368111 written=538
         ->  HashAggregate  (cost=2646093.90..2677531.57 rows=3143767 width=20) (actual time=109808.357..109866.056 rows=113871 loops=1)
               Buffers: shared hit=990953 read=368111 written=538
               ->  Hash Join  (cost=624680.75..2598937.39 rows=3143767 width=20) (actual time=36420.575..109153.686 rows=300620 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=990953 read=368111 written=538
                     ->  Seq Scan on lineitem  (cost=0.00..1820676.68 rows=32571279 width=12) (actual time=0.049..46996.804 rows=32440661 loops=1)
                           Filter: (l_shipdate > '1995-03-12'::date)
                           Rows Removed by Filter: 27604718
                           Buffers: shared hit=738157 read=330451 written=538
                     ->  Hash  (cost=606529.09..606529.09 rows=1452133 width=12) (actual time=36418.446..36418.446 rows=1455429 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62538kB
                           Buffers: shared hit=252796 read=37660
                           ->  Hash Join  (cost=49671.03..606529.09 rows=1452133 width=12) (actual time=2119.137..35099.837 rows=1455429 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=252796 read=37660
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7290678 width=16) (actual time=0.015..10725.722 rows=7278083 loops=1)
                                       Filter: (o_orderdate < '1995-03-12'::date)
                                       Rows Removed by Filter: 7736917
                                       Buffers: shared hit=252793 read=1235
                                 ->  Hash  (cost=45936.47..45936.47 rows=298765 width=4) (actual time=2118.461..2118.461 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=3 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6923.91..45936.47 rows=298765 width=4) (actual time=81.700..1588.409 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=3 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6849.22 rows=298765 width=0) (actual time=73.030..73.030 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 110461.953 ms
(35 rows)

COMMIT;
COMMIT