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#53'
	and p_container = 'SM BOX'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=114406.77..114406.78 rows=1 width=4) (actual time=222.195..222.195 rows=1 loops=1)
   Buffers: shared hit=74320 read=6515 dirtied=144 written=106
   ->  Nested Loop  (cost=82.75..114356.38 rows=20156 width=4) (actual time=1.642..220.747 rows=5416 loops=1)
         Buffers: shared hit=74320 read=6515 dirtied=144 written=106
         ->  Bitmap Heap Scan on part  (cost=72.99..6643.88 rows=2006 width=4) (actual time=1.429..32.875 rows=1989 loops=1)
               Recheck Cond: ((p_container = 'SM BOX'::bpchar) AND (p_brand = 'Brand#53'::bpchar))
               Heap Blocks: exact=1949
               Buffers: shared hit=323 read=1641 written=27
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.49 rows=2006 width=0) (actual time=1.080..1.080 rows=1989 loops=1)
                     Index Cond: ((p_container = 'SM BOX'::bpchar) AND (p_brand = 'Brand#53'::bpchar))
                     Buffers: shared hit=1 read=14 written=1
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.60 rows=10 width=12) (actual time=0.018..0.044 rows=3 loops=1989)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=10611 read=2795 written=48
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.047..0.047 rows=1 loops=1989)
                       Buffers: shared hit=63386 read=2079 dirtied=144 written=31
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.026..0.042 rows=30 loops=1989)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 587
                             Buffers: shared hit=63386 read=2079 dirtied=144 written=31
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.047..0.047 rows=1 loops=1989)
                       Buffers: shared hit=63386 read=2079 dirtied=144 written=31
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.026..0.042 rows=30 loops=1989)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 587
                             Buffers: shared hit=63386 read=2079 dirtied=144 written=31
 Planning time: 2.510 ms
 Execution time: 222.366 ms
(30 rows)

COMMIT;
COMMIT