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 '1995-03-11'
	and l_shipdate > date '1995-03-11'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2682108.45..2682108.47 rows=10 width=20) (actual time=35370.398..35370.403 rows=10 loops=1)
   Buffers: shared hit=680191 read=684139 dirtied=591 written=591
   ->  Sort  (cost=2682108.45..2689968.40 rows=3143981 width=20) (actual time=35370.394..35370.397 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=680191 read=684139 dirtied=591 written=591
         ->  HashAggregate  (cost=2582728.34..2614168.15 rows=3143981 width=20) (actual time=35276.408..35350.172 rows=113901 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=680185 read=684139 dirtied=591 written=591
               ->  Hash Join  (cost=553537.43..2535568.62 rows=3143981 width=20) (actual time=10391.649..34976.629 rows=300742 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=680185 read=684139 dirtied=591 written=591
                     ->  Seq Scan on lineitem  (cost=0.00..1827919.48 rows=32712508 width=12) (actual time=0.050..17602.977 rows=32465755 loops=1)
                           Filter: (l_shipdate > '1995-03-11'::date)
                           Rows Removed by Filter: 27579555
                           Buffers: shared hit=529126 read=543730 dirtied=591 written=591
                     ->  Hash  (cost=535390.83..535390.83 rows=1451728 width=12) (actual time=10379.707..10379.707 rows=1454225 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78871kB
                           Buffers: shared hit=151059 read=140409
                           ->  Hash Join  (cost=49648.90..535390.83 rows=1451728 width=12) (actual time=708.498..9638.228 rows=1454225 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=151059 read=140409
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7299148 width=16) (actual time=0.024..4768.889 rows=7271831 loops=1)
                                       Filter: (o_orderdate < '1995-03-11'::date)
                                       Rows Removed by Filter: 7743169
                                       Buffers: shared hit=151057 read=103984
                                 ->  Hash  (cost=45919.71..45919.71 rows=298335 width=4) (actual time=705.541..705.541 rows=300036 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14645kB
                                       Buffers: shared hit=2 read=36425
                                       ->  Bitmap Heap Scan on customer  (cost=6912.52..45919.71 rows=298335 width=4) (actual time=67.929..612.951 rows=300036 loops=1)
                                             Recheck Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=2 read=36425
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6837.94 rows=298335 width=0) (actual time=59.609..59.609 rows=300036 loops=1)
                                                   Index Cond: (c_mktsegment = 'AUTOMOBILE'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 4.028 ms
 Execution time: 35404.807 ms
(38 rows)

COMMIT;
COMMIT