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 '1995-03-10'
	and l_shipdate > date '1995-03-10'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2744366.51..2744366.53 rows=10 width=20) (actual time=88623.868..88623.872 rows=10 loops=1)
   Buffers: shared hit=1093867 read=265207 dirtied=67 written=57
   ->  Sort  (cost=2744366.51..2752195.41 rows=3131560 width=20) (actual time=88623.862..88623.864 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=1093867 read=265207 dirtied=67 written=57
         ->  HashAggregate  (cost=2645379.02..2676694.62 rows=3131560 width=20) (actual time=88534.188..88603.643 rows=114165 loops=1)
               Buffers: shared hit=1093861 read=265207 dirtied=67 written=57
               ->  Hash Join  (cost=624366.78..2598405.62 rows=3131560 width=20) (actual time=33364.156..88019.878 rows=302371 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1093861 read=265207 dirtied=67 written=57
                     ->  Seq Scan on lineitem  (cost=0.00..1820677.18 rows=32545617 width=12) (actual time=0.097..30246.220 rows=32490801 loops=1)
                           Filter: (l_shipdate > '1995-03-10'::date)
                           Rows Removed by Filter: 27554578
                           Buffers: shared hit=885476 read=183132
                     ->  Hash  (cost=606271.35..606271.35 rows=1447635 width=12) (actual time=33360.905..33360.905 rows=1456957 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 62604kB
                           Buffers: shared hit=208385 read=82075 dirtied=67 written=57
                           ->  Hash Join  (cost=49651.57..606271.35 rows=1447635 width=12) (actual time=1649.603..30172.128 rows=1456957 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=208385 read=82075 dirtied=67 written=57
                                 ->  Seq Scan on orders  (cost=0.00..442089.90 rows=7276620 width=16) (actual time=0.018..8509.653 rows=7265607 loops=1)
                                       Filter: (o_orderdate < '1995-03-10'::date)
                                       Rows Removed by Filter: 7749393
                                       Buffers: shared hit=208383 read=45645 dirtied=67 written=12
                                 ->  Hash  (cost=45921.38..45921.38 rows=298415 width=4) (actual time=1649.028..1649.028 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=2 read=36430 written=45
                                       ->  Bitmap Heap Scan on customer  (cost=6913.20..45921.38 rows=298415 width=4) (actual time=94.280..1305.179 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=2 read=36430 written=45
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6838.59 rows=298415 width=0) (actual time=82.613..82.613 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 88814.124 ms
(35 rows)

COMMIT;
COMMIT