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=929118.86..929119.36 rows=200 width=8) (actual time=70144.177..70144.179 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=290561 read=1280 written=5
   ->  HashAggregate  (cost=929109.21..929111.21 rows=200 width=8) (actual time=70144.050..70144.059 rows=46 loops=1)
         Buffers: shared hit=290558 read=1280 written=5
         ->  HashAggregate  (cost=891609.21..906609.21 rows=1500000 width=8) (actual time=68876.094..69787.879 rows=1500000 loops=1)
               Buffers: shared hit=290558 read=1280 written=5
               ->  Hash Right Join  (cost=69028.00..816392.25 rows=15043393 width=8) (actual time=1403.186..50010.968 rows=15352893 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=290558 read=1280 written=5
                     ->  Seq Scan on orders  (cost=0.00..446496.39 rows=15043393 width=8) (actual time=0.036..11401.867 rows=14852874 loops=1)
                           Filter: ((o_comment)::text !~~ '%unusual%deposits%'::text)
                           Rows Removed by Filter: 162126
                           Buffers: shared hit=255280 read=1280 written=5
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1401.381..1401.381 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=0.012..759.068 rows=1500000 loops=1)
                                 Buffers: shared hit=35278
 Total runtime: 70186.951 ms
(21 rows)

COMMIT;
COMMIT