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 '1995-03-20'
	and l_shipdate > date '1995-03-20'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2771289.75..2771289.78 rows=10 width=20) (actual time=89098.305..89098.308 rows=10 loops=1)
   Buffers: shared hit=791167 read=579766 dirtied=253 written=5
   ->  Sort  (cost=2771289.75..2779281.91 rows=3196864 width=20) (actual time=89098.301..89098.303 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=791167 read=579766 dirtied=253 written=5
         ->  HashAggregate  (cost=2670238.03..2702206.67 rows=3196864 width=20) (actual time=89000.954..89073.698 rows=114179 loops=1)
               Buffers: shared hit=791161 read=579766 dirtied=253 written=5
               ->  Hash Join  (cost=631209.58..2622285.07 rows=3196864 width=20) (actual time=29102.875..88431.553 rows=302048 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=791161 read=579766 dirtied=253 written=5
                     ->  Seq Scan on lineitem  (cost=0.00..1836999.93 rows=32561846 width=12) (actual time=0.073..35179.579 rows=32239577 loops=1)
                           Filter: (l_shipdate > '1995-03-20'::date)
                           Rows Removed by Filter: 27805417
                           Buffers: shared hit=510618 read=567570 written=5
                     ->  Hash  (cost=612580.36..612580.36 rows=1490338 width=12) (actual time=29100.490..29100.490 rows=1469524 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 63144kB
                           Buffers: shared hit=280543 read=12196 dirtied=253
                           ->  Hash Join  (cost=49823.51..612580.36 rows=1490338 width=12) (actual time=1339.742..27818.871 rows=1469524 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=280543 read=12196 dirtied=253
                                 ->  Seq Scan on orders  (cost=0.00..446056.09 rows=7403446 width=16) (actual time=0.018..8196.179 rows=7328331 loops=1)
                                       Filter: (o_orderdate < '1995-03-20'::date)
                                       Rows Removed by Filter: 7686669
                                       Buffers: shared hit=251410 read=4897 dirtied=253
                                 ->  Hash  (cost=46049.07..46049.07 rows=301955 width=4) (actual time=1339.448..1339.448 rows=300276 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 10557kB
                                       Buffers: shared hit=29133 read=7299
                                       ->  Bitmap Heap Scan on customer  (cost=6996.63..46049.07 rows=301955 width=4) (actual time=166.562..1167.848 rows=300276 loops=1)
                                             Recheck Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                             Buffers: shared hit=29133 read=7299
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6921.14 rows=301955 width=0) (actual time=153.644..153.644 rows=300276 loops=1)
                                                   Index Cond: (c_mktsegment = 'BUILDING'::bpchar)
                                                   Buffers: shared read=1155
 Total runtime: 89139.663 ms
(35 rows)

COMMIT;
COMMIT