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 = 'LG JAR'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                               QUERY PLAN                                                                                               
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=354310.39..354310.40 rows=1 width=4) (actual time=801.302..801.302 rows=1 loops=1)
   Buffers: shared hit=55483 read=29394 dirtied=231 written=29
   ->  Nested Loop  (cost=130.19..354260.00 rows=20154 width=4) (actual time=0.971..800.291 rows=5397 loops=1)
         Buffers: shared hit=55483 read=29394 dirtied=231 written=29
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.43..7876.94 rows=1994 width=4) (actual time=0.186..35.809 rows=2019 loops=1)
               Index Cond: ((p_container = 'LG JAR'::bpchar) AND (p_brand = 'Brand#15'::bpchar))
               Heap Fetches: 2019
               Buffers: shared hit=89 read=1897 written=2
         ->  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..0.007 rows=3 loops=2019)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13514
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.368..0.368 rows=1 loops=2019)
                       Buffers: shared hit=41880 read=27497 dirtied=231 written=27
                       ->  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=0.037..0.359 rows=30 loops=2019)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61015
                             Buffers: shared hit=41880 read=27497 dirtied=231 written=27
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.368..0.368 rows=1 loops=2019)
                       Buffers: shared hit=41880 read=27497 dirtied=231 written=27
                       ->  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=0.037..0.359 rows=30 loops=2019)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61015
                             Buffers: shared hit=41880 read=27497 dirtied=231 written=27
 Planning time: 3.138 ms
 Execution time: 801.501 ms
(27 rows)

COMMIT;
COMMIT