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#55'
	and p_container = 'MED BAG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                               QUERY PLAN                                                                                               
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=353949.98..353949.99 rows=1 width=4) (actual time=595.348..595.348 rows=1 loops=1)
   Buffers: shared hit=55937 read=23247 dirtied=92 written=140
   ->  Nested Loop  (cost=130.19..353899.99 rows=19995 width=4) (actual time=0.869..594.423 rows=5071 loops=1)
         Buffers: shared hit=55937 read=23247 dirtied=92 written=140
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.43..7869.47 rows=1992 width=4) (actual time=0.138..29.201 rows=1889 loops=1)
               Index Cond: ((p_container = 'MED BAG'::bpchar) AND (p_brand = 'Brand#55'::bpchar))
               Heap Fetches: 1889
               Buffers: shared hit=85 read=1784 written=12
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=129.76..173.61 rows=10 width=12) (actual time=0.005..0.007 rows=3 loops=1889)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=12679
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.289..0.289 rows=1 loops=1889)
                       Buffers: shared hit=43173 read=21463 dirtied=92 written=128
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem lineitem_1  (cost=0.56..129.11 rows=31 width=4) (actual time=0.031..0.281 rows=30 loops=1889)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 56789
                             Buffers: shared hit=43173 read=21463 dirtied=92 written=128
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.289..0.289 rows=1 loops=1889)
                       Buffers: shared hit=43173 read=21463 dirtied=92 written=128
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem lineitem_1  (cost=0.56..129.11 rows=31 width=4) (actual time=0.031..0.281 rows=30 loops=1889)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 56789
                             Buffers: shared hit=43173 read=21463 dirtied=92 written=128
 Planning time: 2.616 ms
 Execution time: 595.525 ms
(27 rows)

COMMIT;
COMMIT