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#25'
	and p_container = 'JUMBO BOX'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=400284.39..400284.41 rows=1 width=4) (actual time=866.845..866.845 rows=1 loops=1)
   Buffers: shared hit=71368 read=12192 dirtied=88
   ->  Nested Loop  (cost=140.78..400234.48 rows=19965 width=4) (actual time=2.643..865.588 rows=5278 loops=1)
         Buffers: shared hit=71368 read=12192 dirtied=88
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7874.10 rows=1993 width=4) (actual time=0.514..45.330 rows=2003 loops=1)
               Index Cond: ((p_container = 'JUMBO BOX'::bpchar) AND (p_brand = 'Brand#25'::bpchar))
               Heap Fetches: 2003
               Buffers: shared hit=598 read=1365
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.017..0.021 rows=3 loops=2003)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13330
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.383..0.383 rows=1 loops=2003)
                       Buffers: shared hit=57440 read=10827 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=0.045..0.372 rows=30 loops=2003)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59959
                             Buffers: shared hit=57440 read=10827 dirtied=88
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.383..0.383 rows=1 loops=2003)
                       Buffers: shared hit=57440 read=10827 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=0.045..0.372 rows=30 loops=2003)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59959
                             Buffers: shared hit=57440 read=10827 dirtied=88
 Total runtime: 867.085 ms
(26 rows)

COMMIT;
COMMIT