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#21'
	and p_container = 'SM CAN'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=400689.43..400689.45 rows=1 width=4) (actual time=1623.662..1623.662 rows=1 loops=1)
   Buffers: shared hit=55831 read=30162 dirtied=215
   ->  Nested Loop  (cost=140.78..400639.17 rows=20104 width=4) (actual time=0.927..1621.817 rows=5427 loops=1)
         Buffers: shared hit=55831 read=30162 dirtied=215
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7881.25 rows=1995 width=4) (actual time=0.297..77.432 rows=2037 loops=1)
               Index Cond: ((p_container = 'SM CAN'::bpchar) AND (p_brand = 'Brand#21'::bpchar))
               Heap Fetches: 2037
               Buffers: shared read=2006
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.023..0.031 rows=3 loops=2037)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13629
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.720..0.721 rows=1 loops=2037)
                       Buffers: shared hit=42202 read=28156 dirtied=215
                       ->  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=0.083..0.702 rows=30 loops=2037)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61902
                             Buffers: shared hit=42202 read=28156 dirtied=215
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.720..0.721 rows=1 loops=2037)
                       Buffers: shared hit=42202 read=28156 dirtied=215
                       ->  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=0.083..0.702 rows=30 loops=2037)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61902
                             Buffers: shared hit=42202 read=28156 dirtied=215
 Total runtime: 1623.887 ms
(26 rows)

COMMIT;
COMMIT