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#52'
	and p_container = 'JUMBO DRUM'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=405892.43..405892.45 rows=1 width=4) (actual time=1092.300..1092.300 rows=1 loops=1)
   Buffers: shared hit=58432 read=27175 dirtied=69
   ->  Nested Loop  (cost=140.78..405841.77 rows=20266 width=4) (actual time=1.336..1090.562 rows=5479 loops=1)
         Buffers: shared hit=58432 read=27175 dirtied=69
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7978.23 rows=2021 width=4) (actual time=0.221..41.023 rows=2040 loops=1)
               Index Cond: ((p_container = 'JUMBO DRUM'::bpchar) AND (p_brand = 'Brand#52'::bpchar))
               Heap Fetches: 2040
               Buffers: shared hit=525 read=1472
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.76 rows=10 width=12) (actual time=0.011..0.014 rows=3 loops=2040)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13692
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.494..0.494 rows=1 loops=2040)
                       Buffers: shared hit=44215 read=25703 dirtied=69
                       ->  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=0.051..0.478 rows=30 loops=2040)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61437
                             Buffers: shared hit=44215 read=25703 dirtied=69
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.494..0.494 rows=1 loops=2040)
                       Buffers: shared hit=44215 read=25703 dirtied=69
                       ->  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=0.051..0.478 rows=30 loops=2040)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61437
                             Buffers: shared hit=44215 read=25703 dirtied=69
 Total runtime: 1092.493 ms
(26 rows)

COMMIT;
COMMIT