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 '1995-03-13'
	and l_shipdate > date '1995-03-13'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2695984.90..2695984.93 rows=10 width=20) (actual time=34516.644..34516.649 rows=10 loops=1)
   Buffers: shared hit=706610 read=664322 written=106
   ->  Sort  (cost=2695984.90..2703916.28 rows=3172552 width=20) (actual time=34516.640..34516.642 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=706610 read=664322 written=106
         ->  HashAggregate  (cost=2595701.67..2627427.19 rows=3172552 width=20) (actual time=34439.422..34494.746 rows=114142 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=706604 read=664322 written=106
               ->  Hash Join  (cost=556303.95..2548113.39 rows=3172552 width=20) (actual time=9356.717..34169.631 rows=302359 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=706604 read=664322 written=106
                     ->  Seq Scan on lineitem  (cost=0.00..1837000.04 rows=32822370 width=12) (actual time=0.106..19127.336 rows=32415187 loops=1)
                           Filter: (l_shipdate > '1995-03-13'::date)
                           Rows Removed by Filter: 27629807
                           Buffers: shared hit=533993 read=544195
                     ->  Hash  (cost=537963.14..537963.14 rows=1467265 width=12) (actual time=9340.161..9340.161 rows=1460739 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79151kB
                           Buffers: shared hit=172611 read=120127 written=106
                           ->  Hash Join  (cost=49736.01..537963.14 rows=1467265 width=12) (actual time=904.125..8753.937 rows=1460739 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=172611 read=120127 written=106
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7332903 width=16) (actual time=0.035..5228.467 rows=7284464 loops=1)
                                       Filter: (o_orderdate < '1995-03-13'::date)
                                       Rows Removed by Filter: 7730536
                                       Buffers: shared hit=172608 read=83699 written=74
                                 ->  Hash  (cost=45984.26..45984.26 rows=300140 width=4) (actual time=899.921..899.921 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=3 read=36428 written=32
                                       ->  Bitmap Heap Scan on customer  (cost=6954.51..45984.26 rows=300140 width=4) (actual time=116.635..798.697 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=3 read=36428 written=32
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6879.48 rows=300140 width=0) (actual time=104.143..104.143 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154 written=2
 Planning time: 6.194 ms
 Execution time: 34548.809 ms
(38 rows)

COMMIT;
COMMIT