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#55'
	and p_container = 'MED CAN'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                         QUERY PLAN                                                                                          
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=398279.59..398279.60 rows=1 width=4) (actual time=413.171..413.171 rows=1 loops=1)
   Buffers: shared hit=74401 read=8684
   ->  Nested Loop  (cost=140.78..398229.98 rows=19845 width=4) (actual time=1.119..412.346 rows=5269 loops=1)
         Buffers: shared hit=74401 read=8684
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.00..7833.96 rows=1983 width=4) (actual time=0.281..22.235 rows=1979 loops=1)
               Index Cond: ((p_container = 'MED CAN'::bpchar) AND (p_brand = 'Brand#55'::bpchar))
               Heap Fetches: 1979
               Buffers: shared read=1951
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=140.78..196.77 rows=10 width=12) (actual time=0.004..0.005 rows=3 loops=1979)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13217
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.190..0.190 rows=1 loops=1979)
                       Buffers: shared hit=61184 read=6733
                       ->  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=0.026..0.183 rows=30 loops=1979)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59683
                             Buffers: shared hit=61184 read=6733
               SubPlan 1
                 ->  Aggregate  (cost=140.77..140.78 rows=1 width=4) (actual time=0.190..0.190 rows=1 loops=1979)
                       Buffers: shared hit=61184 read=6733
                       ->  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=0.026..0.183 rows=30 loops=1979)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 59683
                             Buffers: shared hit=61184 read=6733
 Total runtime: 413.442 ms
(26 rows)

COMMIT;
COMMIT