BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	sum(l_extendedprice) / 7.0 as avg_yearly
from
	lineitem,
	part
where
	p_partkey = l_partkey
	and p_brand = 'Brand#33'
	and p_container = 'MED BOX'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=405897.04..405897.05 rows=1 width=4) (actual time=1225.478..1225.478 rows=1 loops=1)
   Buffers: shared hit=54090 read=31943 dirtied=357
   ->  Nested Loop  (cost=140.78..405846.02 rows=20407 width=4) (actual time=1.328..1223.738 rows=5559 loops=1)
         Buffers: shared hit=54090 read=31943 dirtied=357
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7978.62 rows=2021 width=4) (actual time=0.318..48.421 rows=2034 loops=1)
               Index Cond: ((p_container = 'MED BOX'::bpchar) AND (p_brand = 'Brand#33'::bpchar))
               Heap Fetches: 2034
               Buffers: shared read=2009
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.017..0.022 rows=3 loops=2034)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13745
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.550..0.550 rows=1 loops=2034)
                       Buffers: shared hit=40345 read=29934 dirtied=357
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.69 rows=31 width=4) (actual time=0.062..0.534 rows=30 loops=2034)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61822
                             Buffers: shared hit=40345 read=29934 dirtied=357
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.550..0.550 rows=1 loops=2034)
                       Buffers: shared hit=40345 read=29934 dirtied=357
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=0.00..140.69 rows=31 width=4) (actual time=0.062..0.534 rows=30 loops=2034)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61822
                             Buffers: shared hit=40345 read=29934 dirtied=357
 Total runtime: 1225.743 ms
(26 rows)

COMMIT;
COMMIT