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#54'
	and p_container = 'LG PACK'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=405099.46..405099.47 rows=1 width=4) (actual time=976.956..976.956 rows=1 loops=1)
   Buffers: shared hit=62682 read=20323 dirtied=311
   ->  Nested Loop  (cost=140.78..405048.69 rows=20306 width=4) (actual time=1.344..975.302 rows=5400 loops=1)
         Buffers: shared hit=62682 read=20323 dirtied=311
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7966.15 rows=2017 width=4) (actual time=0.283..40.145 rows=1970 loops=1)
               Index Cond: ((p_container = 'LG PACK'::bpchar) AND (p_brand = 'Brand#54'::bpchar))
               Heap Fetches: 1970
               Buffers: shared hit=431 read=1511
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.014..0.017 rows=3 loops=1970)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13319
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.452..0.452 rows=1 loops=1970)
                       Buffers: shared hit=48932 read=18812 dirtied=311
                       ->  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=0.050..0.438 rows=30 loops=1970)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59546
                             Buffers: shared hit=48932 read=18812 dirtied=311
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.452..0.452 rows=1 loops=1970)
                       Buffers: shared hit=48932 read=18812 dirtied=311
                       ->  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=0.050..0.438 rows=30 loops=1970)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59546
                             Buffers: shared hit=48932 read=18812 dirtied=311
 Total runtime: 977.218 ms
(26 rows)

COMMIT;
COMMIT