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 '1995-03-01'
	and l_shipdate > date '1995-03-01'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2766190.72..2766190.74 rows=10 width=20) (actual time=81275.399..81275.405 rows=10 loops=1)
   Buffers: shared hit=635732 read=732549 dirtied=249 written=2
   ->  Sort  (cost=2766190.72..2774164.39 rows=3189471 width=20) (actual time=81275.395..81275.396 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=635732 read=732549 dirtied=249 written=2
         ->  HashAggregate  (cost=2665372.68..2697267.39 rows=3189471 width=20) (actual time=81199.068..81254.303 rows=113822 loops=1)
               Buffers: shared hit=635726 read=732549 dirtied=249 written=2
               ->  Hash Join  (cost=628367.33..2617530.62 rows=3189471 width=20) (actual time=25292.970..80676.430 rows=300370 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=635726 read=732549 dirtied=249 written=2
                     ->  Seq Scan on lineitem  (cost=0.00..1833345.58 rows=33046135 width=12) (actual time=0.057..30134.840 rows=32714094 loops=1)
                           Filter: (l_shipdate > '1995-03-01'::date)
                           Rows Removed by Filter: 27330082
                           Buffers: shared hit=348439 read=727607
                     ->  Hash  (cost=610089.72..610089.72 rows=1462209 width=12) (actual time=25290.671..25290.671 rows=1441673 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 61947kB
                           Buffers: shared hit=287287 read=4942 dirtied=249 written=2
                           ->  Hash Join  (cost=49723.39..610089.72 rows=1462209 width=12) (actual time=685.218..24187.950 rows=1441673 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=287287 read=4942 dirtied=249 written=2
                                 ->  Seq Scan on orders  (cost=0.00..445175.49 rows=7314091 width=16) (actual time=0.015..6419.003 rows=7209310 loops=1)
                                       Filter: (o_orderdate < '1995-03-01'::date)
                                       Rows Removed by Filter: 7805690
                                       Buffers: shared hit=254993 read=808 dirtied=249 written=2
                                 ->  Hash  (cost=45974.95..45974.95 rows=299875 width=4) (actual time=684.950..684.950 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=32294 read=4134
                                       ->  Bitmap Heap Scan on customer  (cost=6948.51..45974.95 rows=299875 width=4) (actual time=75.384..540.481 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=32294 read=4134
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6873.54 rows=299875 width=0) (actual time=65.688..65.688 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 81314.818 ms
(35 rows)

COMMIT;
COMMIT