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 PKG'
	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=1119.535..1119.535 rows=1 loops=1)
   Buffers: shared hit=55480 read=29768 dirtied=226 written=56
   ->  Nested Loop  (cost=130.19..354260.00 rows=20154 width=4) (actual time=1.262..1117.964 rows=5417 loops=1)
         Buffers: shared hit=55480 read=29768 dirtied=226 written=56
         ->  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=0.262..52.777 rows=2040 loops=1)
               Index Cond: ((p_container = 'MED PKG'::bpchar) AND (p_brand = 'Brand#55'::bpchar))
               Heap Fetches: 2040
               Buffers: shared hit=34 read=1966 written=8
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=129.76..173.61 rows=10 width=12) (actual time=0.008..0.011 rows=3 loops=2040)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=13634
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.505..0.506 rows=1 loops=2040)
                       Buffers: shared hit=41812 read=27802 dirtied=226 written=48
                       ->  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=0.054..0.489 rows=30 loops=2040)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61130
                             Buffers: shared hit=41812 read=27802 dirtied=226 written=48
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.505..0.506 rows=1 loops=2040)
                       Buffers: shared hit=41812 read=27802 dirtied=226 written=48
                       ->  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=0.054..0.489 rows=30 loops=2040)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 61130
                             Buffers: shared hit=41812 read=27802 dirtied=226 written=48
 Planning time: 5.725 ms
 Execution time: 1119.819 ms
(27 rows)

COMMIT;
COMMIT