BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	c_name,
	c_custkey,
	o_orderkey,
	o_orderdate,
	o_totalprice,
	sum(l_quantity)
from
	customer,
	orders,
	lineitem
where
	o_orderkey in (
		select
			l_orderkey
		from
			lineitem
		group by
			l_orderkey having
				sum(l_quantity) > 312
	)
	and c_custkey = o_custkey
	and o_orderkey = l_orderkey
group by
	c_name,
	c_custkey,
	o_orderkey,
	o_orderdate,
	o_totalprice
order by
	o_totalprice desc,
	o_orderdate
LIMIT 100;
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=10154555.93..10154558.68 rows=100 width=39) (actual time=80551.285..80551.618 rows=100 loops=1)
   Buffers: shared hit=1447344 read=974418 dirtied=910 written=857
   ->  GroupAggregate  (cost=10154555.93..10980186.07 rows=30022914 width=39) (actual time=80551.280..80551.603 rows=100 loops=1)
         Group Key: orders.o_totalprice, orders.o_orderdate, customer.c_name, customer.c_custkey, orders.o_orderkey
         Buffers: shared hit=1447344 read=974418 dirtied=910 written=857
         ->  Sort  (cost=10154555.93..10229613.22 rows=30022914 width=39) (actual time=80551.264..80551.307 rows=701 loops=1)
               Sort Key: orders.o_totalprice, orders.o_orderdate, customer.c_name, customer.c_custkey, orders.o_orderkey
               Sort Method: quicksort  Memory: 85kB
               Buffers: shared hit=1447344 read=974418 dirtied=910 written=857
               ->  Hash Join  (cost=2887098.17..5604833.46 rows=30022914 width=39) (actual time=58011.782..80549.436 rows=777 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1447332 read=974418 dirtied=910 written=857
                     ->  Seq Scan on lineitem  (cost=0.00..1666933.29 rows=60045829 width=8) (actual time=0.017..12484.006 rows=59985329 loops=1)
                           Buffers: shared hit=612167 read=454308 dirtied=909 written=846
                     ->  Hash  (cost=2793254.52..2793254.52 rows=7507492 width=39) (actual time=57519.692..57519.692 rows=111 loops=1)
                           Buckets: 8388608  Batches: 1  Memory Usage: 65544kB
                           Buffers: shared hit=835165 read=520110 dirtied=1 written=11
                           ->  Hash Join  (cost=2179669.96..2793254.52 rows=7507492 width=39) (actual time=50314.056..57518.952 rows=111 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=835165 read=520110 dirtied=1 written=11
                                 ->  Hash Join  (cost=2110641.96..2611614.14 rows=7507492 width=20) (actual time=49146.211..56343.891 rows=111 loops=1)
                                       Hash Cond: (orders.o_orderkey = lineitem_1.l_orderkey)
                                       Buffers: shared hit=800376 read=519621 dirtied=1 written=11
                                       ->  Seq Scan on orders  (cost=0.00..403671.84 rows=15014984 width=16) (actual time=0.012..4017.719 rows=15000000 loops=1)
                                             Buffers: shared hit=155657 read=97865 written=5
                                       ->  Hash  (cost=2059399.27..2059399.27 rows=4099415 width=4) (actual time=48974.143..48974.143 rows=111 loops=1)
                                             Buckets: 4194304  Batches: 1  Memory Usage: 32772kB
                                             Buffers: shared hit=644719 read=421756 dirtied=1 written=6
                                             ->  HashAggregate  (cost=1967162.44..2018405.12 rows=4099415 width=8) (actual time=42776.259..48973.361 rows=111 loops=1)
                                                   Group Key: lineitem_1.l_orderkey
                                                   Filter: (sum(lineitem_1.l_quantity) > 312::double precision)
                                                   Rows Removed by Filter: 14999889
                                                   Buffers: shared hit=644719 read=421756 dirtied=1 written=6
                                                   ->  Seq Scan on lineitem lineitem_1  (cost=0.00..1666933.29 rows=60045829 width=8) (actual time=0.019..13112.033 rows=59985329 loops=1)
                                                         Buffers: shared hit=644719 read=421756 dirtied=1 written=6
                                 ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=23) (actual time=1160.202..1160.202 rows=1500000 loops=1)
                                       Buckets: 2097152  Batches: 1  Memory Usage: 98416kB
                                       Buffers: shared hit=34789 read=489
                                       ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=23) (actual time=0.019..516.214 rows=1500000 loops=1)
                                             Buffers: shared hit=34789 read=489
 Planning time: 3.965 ms
 Execution time: 80701.321 ms
(42 rows)

COMMIT;
COMMIT