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 '1995-03-04'
	and l_shipdate > date '1995-03-04'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2772234.41..2772234.44 rows=10 width=20) (actual time=74350.708..74350.713 rows=10 loops=1)
   Buffers: shared hit=656853 read=714076 dirtied=253 written=1
   ->  Sort  (cost=2772234.41..2780252.04 rows=3207051 width=20) (actual time=74350.703..74350.707 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=656853 read=714076 dirtied=253 written=1
         ->  HashAggregate  (cost=2670860.68..2702931.19 rows=3207051 width=20) (actual time=74231.300..74322.419 rows=113922 loops=1)
               Buffers: shared hit=656847 read=714076 dirtied=253 written=1
               ->  Hash Join  (cost=629803.76..2622754.92 rows=3207051 width=20) (actual time=22384.479..73764.041 rows=300623 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=656847 read=714076 dirtied=253 written=1
                     ->  Seq Scan on lineitem  (cost=0.00..1836996.19 rows=33035857 width=12) (actual time=0.039..27502.400 rows=32640011 loops=1)
                           Filter: (l_shipdate > '1995-03-04'::date)
                           Rows Removed by Filter: 27404983
                           Buffers: shared hit=365265 read=712923 written=1
                     ->  Hash  (cost=611383.32..611383.32 rows=1473635 width=12) (actual time=22382.176..22382.176 rows=1445399 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62107kB
                           Buffers: shared hit=291582 read=1153 dirtied=253
                           ->  Hash Join  (cost=49802.57..611383.32 rows=1473635 width=12) (actual time=503.113..21405.118 rows=1445399 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=291582 read=1153 dirtied=253
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7330059 width=16) (actual time=0.010..5132.894 rows=7228039 loops=1)
                                       Filter: (o_orderdate < '1995-03-04'::date)
                                       Rows Removed by Filter: 7786961
                                       Buffers: shared hit=256307 dirtied=253
                                 ->  Hash  (cost=46033.07..46033.07 rows=301560 width=4) (actual time=502.866..502.866 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=35275 read=1153
                                       ->  Bitmap Heap Scan on customer  (cost=6985.57..46033.07 rows=301560 width=4) (actual time=71.373..409.253 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=35275 read=1153
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.18 rows=301560 width=0) (actual time=62.124..62.124 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 74392.256 ms
(35 rows)

COMMIT;
COMMIT