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 '1995-03-15'
	and l_shipdate > date '1995-03-15'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2698398.16..2698398.19 rows=10 width=20) (actual time=37736.793..37736.798 rows=10 loops=1)
   Buffers: shared hit=637976 read=734283 written=83
   ->  Sort  (cost=2698398.16..2706333.98 rows=3174326 width=20) (actual time=37736.789..37736.791 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=637976 read=734283 written=83
         ->  HashAggregate  (cost=2598058.86..2629802.12 rows=3174326 width=20) (actual time=37670.255..37717.341 rows=114097 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=637970 read=734283 written=83
               ->  Hash Join  (cost=556887.31..2550443.97 rows=3174326 width=20) (actual time=12361.257..37411.747 rows=302381 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=637970 read=734283 written=83
                     ->  Seq Scan on lineitem  (cost=0.00..1838829.90 rows=32795600 width=12) (actual time=0.074..17780.789 rows=32364828 loops=1)
                           Filter: (l_shipdate > '1995-03-15'::date)
                           Rows Removed by Filter: 27680469
                           Buffers: shared hit=463797 read=615465 written=1
                     ->  Hash  (cost=538503.14..538503.14 rows=1470734 width=12) (actual time=12340.466..12340.466 rows=1463251 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79259kB
                           Buffers: shared hit=174173 read=118818 written=82
                           ->  Hash Join  (cost=49736.01..538503.14 rows=1470734 width=12) (actual time=1258.768..11618.621 rows=1463251 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=174173 read=118818 written=82
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7350239 width=16) (actual time=0.027..6332.385 rows=7297127 loops=1)
                                       Filter: (o_orderdate < '1995-03-15'::date)
                                       Rows Removed by Filter: 7717873
                                       Buffers: shared hit=173809 read=82751 written=44
                                 ->  Hash  (cost=45984.26..45984.26 rows=300140 width=4) (actual time=1253.874..1253.874 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=364 read=36067 written=38
                                       ->  Bitmap Heap Scan on customer  (cost=6954.51..45984.26 rows=300140 width=4) (actual time=120.650..1084.565 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=364 read=36067 written=38
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.48 rows=300140 width=0) (actual time=107.541..107.541 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=1
 Planning time: 6.766 ms
 Execution time: 37766.215 ms
(38 rows)

COMMIT;
COMMIT