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 '1995-03-09'
	and l_shipdate > date '1995-03-09'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2669855.79..2669855.81 rows=10 width=20) (actual time=38048.336..38048.342 rows=10 loops=1)
   Buffers: shared hit=754900 read=602858 written=2726
   ->  Sort  (cost=2669855.79..2677703.12 rows=3138934 width=20) (actual time=38048.332..38048.334 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=754900 read=602858 written=2726
         ->  HashAggregate  (cost=2570635.21..2602024.55 rows=3138934 width=20) (actual time=37962.907..38026.850 rows=114070 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=754894 read=602858 written=2726
               ->  Hash Join  (cost=551093.63..2523551.20 rows=3138934 width=20) (actual time=11722.581..37700.385 rows=302214 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=754894 read=602858 written=2726
                     ->  Seq Scan on lineitem  (cost=0.00..1818868.36 rows=32586633 width=12) (actual time=0.061..19408.595 rows=32483938 loops=1)
                           Filter: (l_shipdate > '1995-03-09'::date)
                           Rows Removed by Filter: 27501614
                           Buffers: shared hit=594906 read=472640 written=1
                     ->  Hash  (cost=532996.45..532996.45 rows=1447774 width=12) (actual time=11703.135..11703.135 rows=1454302 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78874kB
                           Buffers: shared hit=159988 read=130218 written=2725
                           ->  Hash Join  (cost=49736.01..532996.45 rows=1447774 width=12) (actual time=1107.358..10941.520 rows=1454302 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=159988 read=130218 written=2725
                                 ->  Seq Scan on orders  (cost=0.00..441649.60 rows=7235493 width=16) (actual time=0.038..5786.092 rows=7252181 loops=1)
                                       Filter: (o_orderdate < '1995-03-09'::date)
                                       Rows Removed by Filter: 7747819
                                       Buffers: shared hit=159985 read=93790 written=2725
                                 ->  Hash  (cost=45984.26..45984.26 rows=300140 width=4) (actual time=1103.399..1103.399 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=3 read=36428
                                       ->  Bitmap Heap Scan on customer  (cost=6954.51..45984.26 rows=300140 width=4) (actual time=126.624..950.068 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=3 read=36428
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.48 rows=300140 width=0) (actual time=109.642..109.642 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 5.855 ms
 Execution time: 38084.209 ms
(38 rows)

COMMIT;
COMMIT