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#23'
	and p_container = 'LG PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=399884.01..399884.02 rows=1 width=4) (actual time=2268.096..2268.097 rows=1 loops=1)
   Buffers: shared hit=56699 read=27803 dirtied=55
   ->  Nested Loop  (cost=140.78..399834.10 rows=19965 width=4) (actual time=4.340..2265.771 rows=5346 loops=1)
         Buffers: shared hit=56699 read=27803 dirtied=55
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7865.18 rows=1991 width=4) (actual time=2.049..96.570 rows=2019 loops=1)
               Index Cond: ((p_container = 'LG PKG'::bpchar) AND (p_brand = 'Brand#23'::bpchar))
               Heap Fetches: 2019
               Buffers: shared hit=200 read=1795
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.042..0.061 rows=3 loops=2019)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13463
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=1.005..1.005 rows=1 loops=2019)
                       Buffers: shared hit=43036 read=26008 dirtied=55
                       ->  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=0.102..0.985 rows=30 loops=2019)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60652
                             Buffers: shared hit=43036 read=26008 dirtied=55
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=1.005..1.005 rows=1 loops=2019)
                       Buffers: shared hit=43036 read=26008 dirtied=55
                       ->  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=0.102..0.985 rows=30 loops=2019)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 60652
                             Buffers: shared hit=43036 read=26008 dirtied=55
 Total runtime: 2268.366 ms
(26 rows)

COMMIT;
COMMIT