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 = 'MED BOX'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=116372.75..116372.76 rows=1 width=4) (actual time=214.716..214.716 rows=1 loops=1)
   Buffers: shared hit=71407 read=7112 dirtied=68 written=93
   ->  Nested Loop  (cost=83.11..116321.63 rows=20446 width=4) (actual time=1.643..213.548 rows=5185 loops=1)
         Buffers: shared hit=71407 read=7112 dirtied=68 written=93
         ->  Bitmap Heap Scan on part  (cost=73.35..6743.98 rows=2041 width=4) (actual time=1.278..35.989 rows=1959 loops=1)
               Recheck Cond: ((p_container = 'MED BOX'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
               Heap Blocks: exact=1922
               Buffers: shared read=1937 written=25
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.84 rows=2041 width=0) (actual time=0.941..0.941 rows=1959 loops=1)
                     Index Cond: ((p_container = 'MED BOX'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
                     Buffers: shared read=15
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.59 rows=10 width=12) (actual time=0.017..0.041 rows=3 loops=1959)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=10622 read=2425 written=28
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.047..0.047 rows=1 loops=1959)
                       Buffers: shared hit=60785 read=2750 dirtied=68 written=40
                       ->  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..0.041 rows=30 loops=1959)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 258
                             Buffers: shared hit=60785 read=2750 dirtied=68 written=40
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.047..0.047 rows=1 loops=1959)
                       Buffers: shared hit=60785 read=2750 dirtied=68 written=40
                       ->  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..0.041 rows=30 loops=1959)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 258
                             Buffers: shared hit=60785 read=2750 dirtied=68 written=40
 Planning time: 2.708 ms
 Execution time: 214.876 ms
(30 rows)

COMMIT;
COMMIT