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=926801.23..926801.73 rows=200 width=8) (actual time=65520.325..65520.329 rows=46 loops=1)
   Sort Key: (count(*)), (count(orders.o_orderkey))
   Sort Method: quicksort  Memory: 27kB
   Buffers: shared hit=290909 read=679
   ->  HashAggregate  (cost=926791.59..926793.59 rows=200 width=8) (actual time=65520.193..65520.203 rows=46 loops=1)
         Buffers: shared hit=290906 read=679
         ->  HashAggregate  (cost=889291.59..904291.59 rows=1500000 width=8) (actual time=64185.176..65140.456 rows=1500000 loops=1)
               Buffers: shared hit=290906 read=679
               ->  Hash Right Join  (cost=69028.00..814450.09 rows=14968300 width=8) (actual time=1340.819..46702.747 rows=15352887 loops=1)
                     Hash Cond: (orders.o_custkey = customer.c_custkey)
                     Buffers: shared hit=290906 read=679
                     ->  Seq Scan on orders  (cost=0.00..446056.09 rows=14968300 width=8) (actual time=0.047..11320.441 rows=14852868 loops=1)
                           Filter: ((o_comment)::text !~~ '%unusual%deposits%'::text)
                           Rows Removed by Filter: 162132
                           Buffers: shared hit=255628 read=679
                     ->  Hash  (cost=50278.00..50278.00 rows=1500000 width=4) (actual time=1338.741..1338.741 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=0.016..753.146 rows=1500000 loops=1)
                                 Buffers: shared hit=35278
 Total runtime: 65549.273 ms
(21 rows)

COMMIT;
COMMIT