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 '%unusual%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=923979.06..923979.56 rows=200 width=8) (actual time=60241.998..60242.001 rows=45 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=290324 read=505 written=82
   ->  HashAggregate  (cost=923969.41..923971.41 rows=200 width=8) (actual time=60241.878..60241.888 rows=45 loops=1)
         Buffers: shared hit=290321 read=505 written=82
         ->  HashAggregate  (cost=886469.41..901469.41 rows=1500000 width=8) (actual time=59153.344..59941.293 rows=1500000 loops=1)
               Buffers: shared hit=290321 read=505 written=82
               ->  Hash Right Join  (cost=69028.00..811928.17 rows=14908249 width=8) (actual time=1137.330..43481.829 rows=15352907 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=290321 read=505 written=82
                     ->  Seq Scan on orders  (cost=0.00..444735.19 rows=14908249 width=8) (actual time=0.030..9225.583 rows=14852888 loops=1)
                           Filter: ((o_comment)::text !~~ '%unusual%deposits%'::text)
                           Rows Removed by Filter: 162112
                           Buffers: shared hit=255049 read=499 written=82
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1135.330..1135.330 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=35272 read=6
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.012..567.670 rows=1500000 loops=1)
                                 Buffers: shared hit=35272 read=6
 Total runtime: 60282.982 ms
(21 rows)

COMMIT;
COMMIT