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#15'
	and p_container = 'WRAP CAN'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                               QUERY PLAN                                                                                               
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=352889.42..352889.43 rows=1 width=4) (actual time=848.412..848.412 rows=1 loops=1)
   Buffers: shared hit=54198 read=27529 dirtied=240 written=49
   ->  Nested Loop  (cost=130.19..352839.14 rows=20113 width=4) (actual time=1.521..847.373 rows=5202 loops=1)
         Buffers: shared hit=54198 read=27529 dirtied=240 written=49
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.43..7844.79 rows=1986 width=4) (actual time=0.160..31.481 rows=1952 loops=1)
               Index Cond: ((p_container = 'WRAP CAN'::bpchar) AND (p_brand = 'Brand#15'::bpchar))
               Heap Fetches: 1952
               Buffers: shared hit=577 read=1353 written=5
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=129.76..173.61 rows=10 width=12) (actual time=0.006..0.008 rows=3 loops=1952)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13063
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.406..0.406 rows=1 loops=1952)
                       Buffers: shared hit=40558 read=26176 dirtied=240 written=44
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem lineitem_1  (cost=0.56..129.11 rows=31 width=4) (actual time=0.041..0.395 rows=30 loops=1952)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 58612
                             Buffers: shared hit=40558 read=26176 dirtied=240 written=44
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.406..0.406 rows=1 loops=1952)
                       Buffers: shared hit=40558 read=26176 dirtied=240 written=44
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem lineitem_1  (cost=0.56..129.11 rows=31 width=4) (actual time=0.041..0.395 rows=30 loops=1952)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 58612
                             Buffers: shared hit=40558 read=26176 dirtied=240 written=44
 Planning time: 4.576 ms
 Execution time: 848.690 ms
(27 rows)

COMMIT;
COMMIT