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 '1995-03-24'
	and l_shipdate > date '1995-03-24'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2776476.27..2776476.29 rows=10 width=20) (actual time=95283.108..95283.111 rows=10 loops=1)
   Buffers: shared hit=882581 read=490985 written=1
   ->  Sort  (cost=2776476.27..2784475.59 rows=3199731 width=20) (actual time=95283.104..95283.106 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=882581 read=490985 written=1
         ->  HashAggregate  (cost=2675333.92..2707331.23 rows=3199731 width=20) (actual time=95190.722..95261.343 rows=113759 loops=1)
               Buffers: shared hit=882575 read=490985 written=1
               ->  Hash Join  (cost=632755.87..2627337.95 rows=3199731 width=20) (actual time=29349.912..94629.824 rows=300287 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=882575 read=490985 written=1
                     ->  Seq Scan on lineitem  (cost=0.00..1840630.70 rows=32521086 width=12) (actual time=0.035..39832.490 rows=32140013 loops=1)
                           Filter: (l_shipdate > '1995-03-24'::date)
                           Rows Removed by Filter: 27905020
                           Buffers: shared hit=645567 read=434752 written=1
                     ->  Hash  (cost=614049.71..614049.71 rows=1496493 width=12) (actual time=29346.848..29346.848 rows=1470596 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63190kB
                           Buffers: shared hit=237008 read=56233
                           ->  Hash Join  (cost=49803.23..614049.71 rows=1496493 width=12) (actual time=1487.720..27915.572 rows=1470596 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=237008 read=56233
                                 ->  Seq Scan on orders  (cost=0.00..446936.69 rows=7443263 width=16) (actual time=0.036..7531.176 rows=7353305 loops=1)
                                       Filter: (o_orderdate < '1995-03-24'::date)
                                       Rows Removed by Filter: 7661695
                                       Buffers: shared hit=236796 read=20017
                                 ->  Hash  (cost=46033.48..46033.48 rows=301580 width=4) (actual time=1487.400..1487.400 rows=300036 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10549kB
                                       Buffers: shared hit=212 read=36216
                                       ->  Bitmap Heap Scan on customer  (cost=6985.73..46033.48 rows=301580 width=4) (actual time=109.245..1307.643 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Buffers: shared hit=212 read=36216
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6910.33 rows=301580 width=0) (actual time=96.112..96.112 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1153
 Total runtime: 95330.252 ms
(35 rows)

COMMIT;
COMMIT