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 = 'BUILDING'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-04'
	and l_shipdate > date '1995-03-04'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2672183.32..2672183.34 rows=10 width=20) (actual time=30106.300..30106.304 rows=10 loops=1)
   Buffers: shared hit=1158752 read=199006 dirtied=1068 written=2
   ->  Sort  (cost=2672183.32..2680101.27 rows=3167181 width=20) (actual time=30106.296..30106.298 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=1158752 read=199006 dirtied=1068 written=2
         ->  HashAggregate  (cost=2572069.86..2603741.67 rows=3167181 width=20) (actual time=30043.114..30087.515 rows=114071 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=1158746 read=199006 dirtied=1068 written=2
               ->  Hash Join  (cost=551393.93..2524562.15 rows=3167181 width=20) (actual time=8684.331..29812.337 rows=301843 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1158746 read=199006 dirtied=1068 written=2
                     ->  Seq Scan on lineitem  (cost=0.00..1818868.06 rows=32700892 width=12) (actual time=0.038..15303.765 rows=32640999 loops=1)
                           Filter: (l_shipdate > '1995-03-04'::date)
                           Rows Removed by Filter: 27404604
                           Buffers: shared hit=869694 read=197852 dirtied=1068 written=2
                     ->  Hash  (cost=533197.71..533197.71 rows=1455698 width=12) (actual time=8649.089..8649.089 rows=1449544 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78670kB
                           Buffers: shared hit=289052 read=1154
                           ->  Hash Join  (cost=49763.50..533197.71 rows=1455698 width=12) (actual time=406.111..8118.129 rows=1449544 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=289052 read=1154
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7260701 width=16) (actual time=0.017..4203.191 rows=7227967 loops=1)
                                       Filter: (o_orderdate < '1995-03-04'::date)
                                       Rows Removed by Filter: 7787033
                                       Buffers: shared hit=253775
                                 ->  Hash  (cost=46004.31..46004.31 rows=300735 width=4) (actual time=401.165..401.165 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=35277 read=1154
                                       ->  Bitmap Heap Scan on customer  (cost=6967.12..46004.31 rows=300735 width=4) (actual time=59.122..308.868 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=35277 read=1154
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6891.94 rows=300735 width=0) (actual time=51.750..51.750 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 5.134 ms
 Execution time: 30148.156 ms
(38 rows)

COMMIT;
COMMIT