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%accounts%'
		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=919817.47..919817.97 rows=200 width=8) (actual time=79851.283..79851.289 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=268171 read=20885
   ->  HashAggregate  (cost=919807.82..919809.82 rows=200 width=8) (actual time=79851.147..79851.155 rows=46 loops=1)
         Buffers: shared hit=268168 read=20885
         ->  HashAggregate  (cost=882307.82..897307.82 rows=1500000 width=8) (actual time=78543.899..79493.094 rows=1500000 loops=1)
               Buffers: shared hit=268168 read=20885
               ->  Hash Right Join  (cost=69028.00..807981.78 rows=14865209 width=8) (actual time=2016.579..56303.479 rows=15338207 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=268168 read=20885
                     ->  Seq Scan on orders  (cost=0.00..441649.60 rows=14865209 width=8) (actual time=0.051..14193.132 rows=14838191 loops=1)
                           Filter: ((o_comment)::text !~~ '%pending%accounts%'::text)
                           Rows Removed by Filter: 161809
                           Buffers: shared hit=232890 read=20885
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=2014.235..2014.235 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=35278
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.014..1238.487 rows=1500000 loops=1)
                                 Buffers: shared hit=35278
 Total runtime: 79897.103 ms
(21 rows)

COMMIT;
COMMIT