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 = 'LG DRUM'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=402687.67..402687.69 rows=1 width=4) (actual time=687.464..687.465 rows=1 loops=1)
   Buffers: shared hit=66164 read=10315 dirtied=88
   ->  Nested Loop  (cost=140.78..402637.46 rows=20085 width=4) (actual time=1.391..686.210 rows=4902 loops=1)
         Buffers: shared hit=66164 read=10315 dirtied=88
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7917.93 rows=2005 width=4) (actual time=0.219..33.351 rows=1830 loops=1)
               Index Cond: ((p_container = 'LG DRUM'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
               Heap Fetches: 1830
               Buffers: shared hit=627 read=1172
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.008..0.011 rows=3 loops=1830)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=12254
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.341..0.341 rows=1 loops=1830)
                       Buffers: shared hit=53283 read=9143 dirtied=88
                       ->  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=0.042..0.328 rows=30 loops=1830)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 54820
                             Buffers: shared hit=53283 read=9143 dirtied=88
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.341..0.341 rows=1 loops=1830)
                       Buffers: shared hit=53283 read=9143 dirtied=88
                       ->  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=0.042..0.328 rows=30 loops=1830)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 54820
                             Buffers: shared hit=53283 read=9143 dirtied=88
 Total runtime: 687.639 ms
(26 rows)

COMMIT;
COMMIT