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=2699652.48..2699652.50 rows=10 width=20) (actual time=38611.109..38611.114 rows=10 loops=1)
   Buffers: shared hit=595061 read=777198 dirtied=917 written=1149
   ->  Sort  (cost=2699652.48..2707623.09 rows=3188246 width=20) (actual time=38611.106..38611.107 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=595061 read=777198 dirtied=917 written=1149
         ->  HashAggregate  (cost=2598873.17..2630755.63 rows=3188246 width=20) (actual time=38534.666..38590.409 rows=114125 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=595055 read=777198 dirtied=917 written=1149
               ->  Hash Join  (cost=556942.43..2551049.48 rows=3188246 width=20) (actual time=11968.837..38237.868 rows=302107 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=595055 read=777198 dirtied=917 written=1149
                     ->  Seq Scan on lineitem  (cost=0.00..1838833.75 rows=32904225 width=12) (actual time=0.028..19469.401 rows=32464985 loops=1)
                           Filter: (l_shipdate > '1995-03-11'::date)
                           Rows Removed by Filter: 27580312
                           Buffers: shared hit=460449 read=618813 dirtied=917 written=888
                     ->  Hash  (cost=538538.59..538538.59 rows=1472307 width=12) (actual time=11950.934..11950.934 rows=1458176 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 79040kB
                           Buffers: shared hit=134606 read=158385 written=261
                           ->  Hash Join  (cost=49741.42..538538.59 rows=1472307 width=12) (actual time=920.181..11320.070 rows=1458176 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=134606 read=158385 written=261
                                 ->  Seq Scan on orders  (cost=0.00..446496.39 rows=7354057 width=16) (actual time=0.029..5908.797 rows=7272073 loops=1)
                                       Filter: (o_orderdate < '1995-03-11'::date)
                                       Rows Removed by Filter: 7742927
                                       Buffers: shared hit=134604 read=121956 written=215
                                 ->  Hash  (cost=45987.60..45987.60 rows=300305 width=4) (actual time=915.652..915.652 rows=300276 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14653kB
                                       Buffers: shared hit=2 read=36429 written=46
                                       ->  Bitmap Heap Scan on customer  (cost=6955.79..45987.60 rows=300305 width=4) (actual time=81.459..791.141 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Heap Blocks: exact=35277
                                             Buffers: shared hit=2 read=36429 written=46
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6880.72 rows=300305 width=0) (actual time=71.696..71.696 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1154
 Planning time: 4.366 ms
 Execution time: 38637.347 ms
(38 rows)

COMMIT;
COMMIT