BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	c_count,
	count(*) as custdist
from
	(
		select
			c_custkey,
			count(o_orderkey)
		from
			customer left outer join orders on
				c_custkey = o_custkey
				and o_comment not like '%pending%deposits%'
		group by
			c_custkey
	) as c_orders (c_custkey, c_count)
group by
	c_count
order by
	custdist desc,
	c_count desc;
                                                                    QUERY PLAN                                                                     
---------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=927610.88..927611.38 rows=200 width=8) (actual time=69429.693..69429.696 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=233730 read=58111 written=652
   ->  HashAggregate  (cost=927601.24..927603.24 rows=200 width=8) (actual time=69429.558..69429.575 rows=46 loops=1)
         Buffers: shared hit=233727 read=58111 written=652
         ->  HashAggregate  (cost=890101.24..905101.24 rows=1500000 width=8) (actual time=68047.341..69085.873 rows=1500000 loops=1)
               Buffers: shared hit=233727 read=58111 written=652
               ->  Hash Right Join  (cost=69028.00..815185.87 rows=14983074 width=8) (actual time=2472.602..50096.293 rows=15352973 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=233727 read=58111 written=652
                     ->  Seq Scan on orders  (cost=0.00..446496.39 rows=14983074 width=8) (actual time=0.033..10651.028 rows=14852952 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%deposits%'::text)
                           Rows Removed by Filter: 162048
                           Buffers: shared hit=233724 read=22836 written=652
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=2470.513..2470.513 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=3 read=35275
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.013..1071.482 rows=1500000 loops=1)
                                 Buffers: shared hit=3 read=35275
 Total runtime: 69493.897 ms
(21 rows)

COMMIT;
COMMIT