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=921000.77..921001.27 rows=200 width=8) (actual time=73972.596..73972.599 rows=45 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=255389 read=33920
   ->  HashAggregate  (cost=920991.13..920993.13 rows=200 width=8) (actual time=73972.481..73972.494 rows=45 loops=1)
         Buffers: shared hit=255386 read=33920
         ->  HashAggregate  (cost=883491.13..898491.13 rows=1500000 width=8) (actual time=72710.756..73607.654 rows=1500000 loops=1)
               Buffers: shared hit=255386 read=33920
               ->  Hash Right Join  (cost=69028.00..809016.48 rows=14894929 width=8) (actual time=2043.878..53013.836 rows=15352910 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=255386 read=33920
                     ->  Seq Scan on orders  (cost=0.00..442089.90 rows=14894929 width=8) (actual time=0.040..12131.785 rows=14852891 loops=1)
                           Filter: ((o_comment)::text !~~ '%unusual%deposits%'::text)
                           Rows Removed by Filter: 162109
                           Buffers: shared hit=244290 read=9738
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=2041.218..2041.218 rows=1500000 loops=1)
                           Buckets: 262144  Batches: 1  Memory Usage: 52735kB
                           Buffers: shared hit=11096 read=24182
                           ->  Seq Scan on customer  (cost=0.00..50278.00 rows=1500000 width=4) (actual time=0.014..905.590 rows=1500000 loops=1)
                                 Buffers: shared hit=11096 read=24182
 Total runtime: 74043.208 ms
(21 rows)

COMMIT;
COMMIT