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#31'
	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=355011.68..355011.69 rows=1 width=4) (actual time=819.457..819.457 rows=1 loops=1)
   Buffers: shared hit=55253 read=32167 dirtied=56 written=2037
   ->  Nested Loop  (cost=130.19..354961.55 rows=20052 width=4) (actual time=0.956..818.442 rows=5550 loops=1)
         Buffers: shared hit=55253 read=32167 dirtied=56 written=2037
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.43..7889.89 rows=1998 width=4) (actual time=0.154..27.650 rows=2085 loops=1)
               Index Cond: ((p_container = 'MED BAG'::bpchar) AND (p_brand = 'Brand#31'::bpchar))
               Heap Fetches: 2085
               Buffers: shared hit=1000 read=1057 written=78
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=129.76..173.61 rows=10 width=12) (actual time=0.006..0.007 rows=3 loops=2085)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13947
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.369..0.369 rows=1 loops=2085)
                       Buffers: shared hit=40306 read=31110 dirtied=56 written=1959
                       ->  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=0.037..0.359 rows=30 loops=2085)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 62747
                             Buffers: shared hit=40306 read=31110 dirtied=56 written=1959
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.369..0.369 rows=1 loops=2085)
                       Buffers: shared hit=40306 read=31110 dirtied=56 written=1959
                       ->  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=0.037..0.359 rows=30 loops=2085)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 62747
                             Buffers: shared hit=40306 read=31110 dirtied=56 written=1959
 Planning time: 3.064 ms
 Execution time: 819.647 ms
(27 rows)

COMMIT;
COMMIT