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#33'
	and p_container = 'LG BOX'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=408098.93..408098.94 rows=1 width=4) (actual time=1382.620..1382.620 rows=1 loops=1)
   Buffers: shared hit=57553 read=28170 dirtied=54
   ->  Nested Loop  (cost=140.78..408047.99 rows=20376 width=4) (actual time=1.098..1381.037 rows=5469 loops=1)
         Buffers: shared hit=57553 read=28170 dirtied=54
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..8022.83 rows=2032 width=4) (actual time=0.234..60.801 rows=2044 loops=1)
               Index Cond: ((p_container = 'LG BOX'::bpchar) AND (p_brand = 'Brand#33'::bpchar))
               Heap Fetches: 2044
               Buffers: shared read=2010
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.76 rows=10 width=12) (actual time=0.019..0.026 rows=3 loops=2044)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13679
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.614..0.614 rows=1 loops=2044)
                       Buffers: shared hit=43874 read=26160 dirtied=54
                       ->  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=0.071..0.600 rows=30 loops=2044)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61549
                             Buffers: shared hit=43874 read=26160 dirtied=54
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.614..0.614 rows=1 loops=2044)
                       Buffers: shared hit=43874 read=26160 dirtied=54
                       ->  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=0.071..0.600 rows=30 loops=2044)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61549
                             Buffers: shared hit=43874 read=26160 dirtied=54
 Total runtime: 1382.832 ms
(26 rows)

COMMIT;
COMMIT