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 '1995-03-16'
	and l_shipdate > date '1995-03-16'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2696674.09..2696674.11 rows=10 width=20) (actual time=35493.745..35493.749 rows=10 loops=1)
   Buffers: shared hit=794672 read=576256 written=167
   ->  Sort  (cost=2696674.09..2704636.72 rows=3185054 width=20) (actual time=35493.741..35493.744 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=794672 read=576256 written=167
         ->  HashAggregate  (cost=2595995.67..2627846.21 rows=3185054 width=20) (actual time=35420.071..35473.262 rows=113954 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=794666 read=576256 written=167
               ->  Hash Join  (cost=556822.17..2548219.86 rows=3185054 width=20) (actual time=9192.826..35139.235 rows=300486 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=794666 read=576256 written=167
                     ->  Seq Scan on lineitem  (cost=0.00..1837004.34 rows=32678084 width=12) (actual time=0.026..18404.041 rows=32340072 loops=1)
                           Filter: (l_shipdate > '1995-03-16'::date)
                           Rows Removed by Filter: 27704922
                           Buffers: shared hit=560345 read=517843
                     ->  Hash  (cost=538327.78..538327.78 rows=1479551 width=12) (actual time=9175.387..9175.387 rows=1460453 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79138kB
                           Buffers: shared hit=234321 read=58413 written=167
                           ->  Hash Join  (cost=49723.50..538327.78 rows=1479551 width=12) (actual time=529.404..8580.391 rows=1460453 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=234321 read=58413 written=167
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7400717 width=16) (actual time=0.024..4797.888 rows=7303246 loops=1)
                                       Filter: (o_orderdate < '1995-03-16'::date)
                                       Rows Removed by Filter: 7711754
                                       Buffers: shared hit=207173 read=49134 written=3
                                 ->  Hash  (cost=45975.00..45975.00 rows=299880 width=4) (actual time=526.107..526.107 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=27148 read=9279 written=164
                                       ->  Bitmap Heap Scan on customer  (cost=6948.50..45975.00 rows=299880 width=4) (actual time=65.642..431.886 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=27148 read=9279 written=164
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.53 rows=299880 width=0) (actual time=57.295..57.295 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152 written=6
 Planning time: 3.893 ms
 Execution time: 35515.216 ms
(38 rows)

COMMIT;
COMMIT