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#45'
	and p_container = 'SM DRUM'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=405690.21..405690.22 rows=1 width=4) (actual time=1413.806..1413.806 rows=1 loops=1)
   Buffers: shared hit=51720 read=30188 dirtied=41
   ->  Nested Loop  (cost=140.78..405639.57 rows=20256 width=4) (actual time=3.454..1411.499 rows=5213 loops=1)
         Buffers: shared hit=51720 read=30188 dirtied=41
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7974.53 rows=2020 width=4) (actual time=0.388..61.739 rows=1952 loops=1)
               Index Cond: ((p_container = 'SM DRUM'::bpchar) AND (p_brand = 'Brand#45'::bpchar))
               Heap Fetches: 1952
               Buffers: shared read=1924
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.76 rows=10 width=12) (actual time=0.015..0.022 rows=3 loops=1952)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13060
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.663..0.663 rows=1 loops=1952)
                       Buffers: shared hit=38660 read=28264 dirtied=41
                       ->  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=0.076..0.645 rows=30 loops=1952)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 58824
                             Buffers: shared hit=38660 read=28264 dirtied=41
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.663..0.663 rows=1 loops=1952)
                       Buffers: shared hit=38660 read=28264 dirtied=41
                       ->  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=0.076..0.645 rows=30 loops=1952)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 58824
                             Buffers: shared hit=38660 read=28264 dirtied=41
 Total runtime: 1414.110 ms
(26 rows)

COMMIT;
COMMIT