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#51'
	and p_container = 'SM JAR'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=411501.13..411501.14 rows=1 width=4) (actual time=1270.796..1270.796 rows=1 loops=1)
   Buffers: shared hit=53655 read=32511 dirtied=85
   ->  Nested Loop  (cost=140.78..411449.76 rows=20547 width=4) (actual time=2.844..1268.925 rows=5440 loops=1)
         Buffers: shared hit=53655 read=32511 dirtied=85
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..8087.20 rows=2049 width=4) (actual time=0.280..43.566 rows=2051 loops=1)
               Index Cond: ((p_container = 'SM JAR'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
               Heap Fetches: 2051
               Buffers: shared hit=484 read=1530
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.76 rows=10 width=12) (actual time=0.013..0.016 rows=3 loops=2051)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13690
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.574..0.574 rows=1 loops=2051)
                       Buffers: shared hit=39481 read=30981 dirtied=85
                       ->  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=0.057..0.555 rows=30 loops=2051)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61932
                             Buffers: shared hit=39481 read=30981 dirtied=85
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.574..0.574 rows=1 loops=2051)
                       Buffers: shared hit=39481 read=30981 dirtied=85
                       ->  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=0.057..0.555 rows=30 loops=2051)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61932
                             Buffers: shared hit=39481 read=30981 dirtied=85
 Total runtime: 1271.027 ms
(26 rows)

COMMIT;
COMMIT