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#54'
	and p_container = 'MED PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=407498.84..407498.85 rows=1 width=4) (actual time=1154.473..1154.473 rows=1 loops=1)
   Buffers: shared hit=52536 read=32260 dirtied=158
   ->  Nested Loop  (cost=140.78..407447.92 rows=20366 width=4) (actual time=1.325..1152.824 rows=5333 loops=1)
         Buffers: shared hit=52536 read=32260 dirtied=158
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..8010.38 rows=2029 width=4) (actual time=0.387..20.973 rows=2029 loops=1)
               Index Cond: ((p_container = 'MED PKG'::bpchar) AND (p_brand = 'Brand#54'::bpchar))
               Heap Fetches: 2029
               Buffers: shared hit=1997 read=16
         ->  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=2029)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13491
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.538..0.538 rows=1 loops=2029)
                       Buffers: shared hit=37048 read=32244 dirtied=158
                       ->  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=0.054..0.523 rows=30 loops=2029)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60857
                             Buffers: shared hit=37048 read=32244 dirtied=158
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.538..0.538 rows=1 loops=2029)
                       Buffers: shared hit=37048 read=32244 dirtied=158
                       ->  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=0.054..0.523 rows=30 loops=2029)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60857
                             Buffers: shared hit=37048 read=32244 dirtied=158
 Total runtime: 1154.742 ms
(26 rows)

COMMIT;
COMMIT