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 '1995-03-28'
	and l_shipdate > date '1995-03-28'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2766441.64..2766441.66 rows=10 width=20) (actual time=122983.548..122983.553 rows=10 loops=1)
   Buffers: shared hit=1162772 read=206836 written=208
   ->  Sort  (cost=2766441.64..2774350.41 rows=3163507 width=20) (actual time=122983.543..122983.545 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=1162772 read=206836 written=208
         ->  HashAggregate  (cost=2666444.32..2698079.39 rows=3163507 width=20) (actual time=122871.428..122957.697 rows=113648 loops=1)
               Buffers: shared hit=1162766 read=206836 written=208
               ->  Hash Join  (cost=631138.16..2618991.71 rows=3163507 width=20) (actual time=37973.521..122207.177 rows=300125 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1162766 read=206836 written=208
                     ->  Seq Scan on lineitem  (cost=0.00..1835173.36 rows=32278699 width=12) (actual time=0.061..60734.350 rows=32039730 loops=1)
                           Filter: (l_shipdate > '1995-03-28'::date)
                           Rows Removed by Filter: 28005142
                           Buffers: shared hit=888491 read=188629 written=208
                     ->  Hash  (cost=612559.96..612559.96 rows=1486256 width=12) (actual time=37970.366..37970.366 rows=1475493 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63401kB
                           Buffers: shared hit=274275 read=18207
                           ->  Hash Join  (cost=49700.16..612559.96 rows=1486256 width=12) (actual time=2340.647..36999.864 rows=1475493 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=274275 read=18207
                                 ->  Seq Scan on orders  (cost=0.00..445615.79 rows=7445924 width=16) (actual time=0.019..13735.394 rows=7378043 loops=1)
                                       Filter: (o_orderdate < '1995-03-28'::date)
                                       Rows Removed by Filter: 7636957
                                       Buffers: shared hit=245153 read=10901
                                 ->  Hash  (cost=45957.53..45957.53 rows=299410 width=4) (actual time=2340.344..2340.344 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=29122 read=7306
                                       ->  Bitmap Heap Scan on customer  (cost=6936.91..45957.53 rows=299410 width=4) (actual time=235.254..2166.382 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=29122 read=7306
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6862.06 rows=299410 width=0) (actual time=214.044..214.044 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared hit=13 read=1140
 Total runtime: 123024.325 ms
(35 rows)

COMMIT;
COMMIT