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#45'
	and p_container = 'WRAP DRUM'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=392863.92..392863.93 rows=1 width=4) (actual time=649.858..649.859 rows=1 loops=1)
   Buffers: shared hit=68580 read=14333 dirtied=120
   ->  Nested Loop  (cost=140.78..392814.84 rows=19634 width=4) (actual time=1.036..648.834 rows=5239 loops=1)
         Buffers: shared hit=68580 read=14333 dirtied=120
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7724.67 rows=1956 width=4) (actual time=0.213..30.942 rows=1985 loops=1)
               Index Cond: ((p_container = 'WRAP DRUM'::bpchar) AND (p_brand = 'Brand#45'::bpchar))
               Heap Fetches: 1985
               Buffers: shared hit=433 read=1521
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.78 rows=10 width=12) (actual time=0.006..0.008 rows=3 loops=1985)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13222
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.299..0.299 rows=1 loops=1985)
                       Buffers: shared hit=54925 read=12812 dirtied=120
                       ->  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=0.035..0.290 rows=30 loops=1985)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59503
                             Buffers: shared hit=54925 read=12812 dirtied=120
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.299..0.299 rows=1 loops=1985)
                       Buffers: shared hit=54925 read=12812 dirtied=120
                       ->  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=0.035..0.290 rows=30 loops=1985)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59503
                             Buffers: shared hit=54925 read=12812 dirtied=120
 Total runtime: 650.025 ms
(26 rows)

COMMIT;
COMMIT