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#23'
	and p_container = 'WRAP CASE'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=404087.07..404087.09 rows=1 width=4) (actual time=422.406..422.406 rows=1 loops=1)
   Buffers: shared hit=76628 read=9344
   ->  Nested Loop  (cost=140.78..404036.74 rows=20135 width=4) (actual time=1.349..421.554 rows=5550 loops=1)
         Buffers: shared hit=76628 read=9344
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7945.56 rows=2012 width=4) (actual time=0.237..20.186 rows=2043 loops=1)
               Index Cond: ((p_container = 'WRAP CASE'::bpchar) AND (p_brand = 'Brand#23'::bpchar))
               Heap Fetches: 2043
               Buffers: shared read=2008
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.76 rows=10 width=12) (actual time=0.004..0.005 rows=3 loops=2043)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13758
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.189..0.189 rows=1 loops=2043)
                       Buffers: shared hit=62870 read=7336
                       ->  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=0.023..0.183 rows=30 loops=2043)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61724
                             Buffers: shared hit=62870 read=7336
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.189..0.189 rows=1 loops=2043)
                       Buffers: shared hit=62870 read=7336
                       ->  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=0.023..0.183 rows=30 loops=2043)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61724
                             Buffers: shared hit=62870 read=7336
 Total runtime: 422.652 ms
(26 rows)

COMMIT;
COMMIT