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 '1995-03-11'
	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=2685901.83..2685901.85 rows=10 width=20) (actual time=39173.840..39173.846 rows=10 loops=1)
   Buffers: shared hit=659822 read=704512 dirtied=721 written=66
   ->  Sort  (cost=2685901.83..2693888.69 rows=3194744 width=20) (actual time=39173.835..39173.838 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=659822 read=704512 dirtied=721 written=66
         ->  HashAggregate  (cost=2584917.12..2616864.56 rows=3194744 width=20) (actual time=39084.433..39153.343 rows=114121 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=659816 read=704512 dirtied=721 written=66
               ->  Hash Join  (cost=554243.47..2536995.96 rows=3194744 width=20) (actual time=10305.977..38759.921 rows=302059 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=659816 read=704512 dirtied=721 written=66
                     ->  Seq Scan on lineitem  (cost=0.00..1827917.98 rows=32769885 width=12) (actual time=0.029..19969.759 rows=32465755 loops=1)
                           Filter: (l_shipdate > '1995-03-11'::date)
                           Rows Removed by Filter: 27579555
                           Buffers: shared hit=507196 read=565660 dirtied=214 written=7
                     ->  Hash  (cost=535836.16..535836.16 rows=1472585 width=12) (actual time=10297.942..10297.942 rows=1458145 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79039kB
                           Buffers: shared hit=152620 read=138852 dirtied=507 written=59
                           ->  Hash Join  (cost=49816.18..535836.16 rows=1472585 width=12) (actual time=501.258..9702.707 rows=1458145 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=152620 read=138852 dirtied=507 written=59
                                 ->  Seq Scan on orders  (cost=0.00..443852.85 rows=7317675 width=16) (actual time=0.021..5527.547 rows=7271831 loops=1)
                                       Filter: (o_orderdate < '1995-03-11'::date)
                                       Rows Removed by Filter: 7743169
                                       Buffers: shared hit=117343 read=137698 dirtied=507 written=58
                                 ->  Hash  (cost=46042.99..46042.99 rows=301855 width=4) (actual time=498.723..498.723 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=35277 read=1154 written=1
                                       ->  Bitmap Heap Scan on customer  (cost=6991.80..46042.99 rows=301855 width=4) (actual time=74.580..409.621 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=35277 read=1154 written=1
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6916.34 rows=301855 width=0) (actual time=64.964..64.964 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=1
 Planning time: 3.555 ms
 Execution time: 39196.742 ms
(38 rows)

COMMIT;
COMMIT