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=917498.32..917498.82 rows=200 width=8) (actual time=55715.493..55715.495 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=280078 read=8725
   ->  HashAggregate  (cost=917488.68..917490.68 rows=200 width=8) (actual time=55715.362..55715.372 rows=46 loops=1)
         Buffers: shared hit=280075 read=8725
         ->  HashAggregate  (cost=879988.68..894988.68 rows=1500000 width=8) (actual time=54484.199..55416.227 rows=1500000 loops=1)
               Buffers: shared hit=280075 read=8725
               ->  Hash Right Join  (cost=69028.00..806038.40 rows=14790055 width=8) (actual time=863.578..40185.124 rows=15352915 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=280075 read=8725
                     ->  Seq Scan on orders  (cost=0.00..441209.30 rows=14790055 width=8) (actual time=0.036..7462.904 rows=14852894 loops=1)
                           Filter: ((o_comment)::text !~~ '%unusual%deposits%'::text)
                           Rows Removed by Filter: 162106
                           Buffers: shared hit=252279 read=1243
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=861.773..861.773 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=27796 read=7482
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.031..497.497 rows=1500000 loops=1)
                                 Buffers: shared hit=27796 read=7482
 Total runtime: 55743.254 ms
(21 rows)

COMMIT;
COMMIT