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=10421232.16..10421234.91 rows=100 width=39) (actual time=178046.048..178046.450 rows=100 loops=1)
   Buffers: shared hit=1431685 read=1013901 dirtied=242 written=922
   ->  GroupAggregate  (cost=10421232.16..11255097.36 rows=30322371 width=39) (actual time=178046.045..178046.434 rows=100 loops=1)
         Buffers: shared hit=1431685 read=1013901 dirtied=242 written=922
         ->  Sort  (cost=10421232.16..10497038.09 rows=30322371 width=39) (actual time=178046.016..178046.071 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: 86kB
               Buffers: shared hit=1431685 read=1013901 dirtied=242 written=922
               ->  Hash Join  (cost=3079110.00..5823960.43 rows=30322371 width=39) (actual time=121413.535..178040.618 rows=784 loops=1)
                     Hash Cond: (public.lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1431671 read=1013901 dirtied=242 written=922
                     ->  Seq Scan on lineitem  (cost=0.00..1683567.42 rows=60644742 width=8) (actual time=0.049..40798.742 rows=60044872 loops=1)
                           Buffers: shared hit=536681 read=540439
                     ->  Hash  (cost=2984329.10..2984329.10 rows=7582472 width=39) (actual time=121012.898..121012.898 rows=112 loops=1)
                           Buckets: 1048576  Batches: 1  Memory Usage: 8kB
                           Buffers: shared hit=894990 read=473462 dirtied=242 written=922
                           ->  Hash Join  (cost=2195504.38..2984329.10 rows=7582472 width=39) (actual time=106463.822..121012.140 rows=112 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=894990 read=473462 dirtied=242 written=922
                                 ->  Hash Join  (cost=2126476.38..2763651.66 rows=7582472 width=20) (actual time=103216.228..117762.645 rows=112 loops=1)
                                       Hash Cond: (orders.o_orderkey = public.lineitem.l_orderkey)
                                       Buffers: shared hit=888578 read=444596 dirtied=242 written=922
                                       ->  Seq Scan on orders  (cost=0.00..407703.43 rows=15164943 width=16) (actual time=0.019..8787.243 rows=15015000 loops=1)
                                             Buffers: shared hit=249578 read=6476 dirtied=16 written=767
                                       ->  Hash  (cost=2076588.79..2076588.79 rows=3991007 width=4) (actual time=102893.468..102893.468 rows=112 loops=1)
                                             Buckets: 524288  Batches: 1  Memory Usage: 4kB
                                             Buffers: shared hit=639000 read=438120 dirtied=226 written=155
                                             ->  HashAggregate  (cost=1986791.13..2036678.72 rows=3991007 width=8) (actual time=94646.250..102892.223 rows=112 loops=1)
                                                   Filter: (sum(public.lineitem.l_quantity) > 312::double precision)
                                                   Rows Removed by Filter: 15014888
                                                   Buffers: shared hit=639000 read=438120 dirtied=226 written=155
                                                   ->  Seq Scan on lineitem  (cost=0.00..1683567.42 rows=60644742 width=8) (actual time=0.023..41625.621 rows=60044872 loops=1)
                                                         Buffers: shared hit=639000 read=438120 dirtied=226 written=155
                                 ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=23) (actual time=3245.520..3245.520 rows=1500000 loops=1)
                                       Buckets: 262144  Batches: 1  Memory Usage: 82032kB
                                       Buffers: shared hit=6412 read=28866
                                       ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=23) (actual time=0.012..2399.431 rows=1500000 loops=1)
                                             Buffers: shared hit=6412 read=28866
 Total runtime: 178255.450 ms
(39 rows)

COMMIT;
COMMIT