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#51'
	and p_container = 'JUMBO BOX'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=114864.37..114864.39 rows=1 width=4) (actual time=229.215..229.215 rows=1 loops=1)
   Buffers: shared hit=78003 read=4886 dirtied=396 written=53
   ->  Nested Loop  (cost=82.84..114813.38 rows=20397 width=4) (actual time=2.299..227.685 rows=5428 loops=1)
         Buffers: shared hit=78003 read=4886 dirtied=396 written=53
         ->  Bitmap Heap Scan on part  (cost=73.07..6668.16 rows=2014 width=4) (actual time=1.658..15.694 rows=2016 loops=1)
               Recheck Cond: ((p_container = 'JUMBO BOX'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
               Heap Blocks: exact=1978
               Buffers: shared hit=1978 read=15
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.57 rows=2014 width=0) (actual time=1.271..1.271 rows=2016 loops=1)
                     Index Cond: ((p_container = 'JUMBO BOX'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
                     Buffers: shared read=15
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.60 rows=10 width=12) (actual time=0.016..0.040 rows=3 loops=2016)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=11584 read=1949 written=23
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.062..0.062 rows=1 loops=2016)
                       Buffers: shared hit=64441 read=2922 dirtied=396 written=30
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.031..0.056 rows=30 loops=2016)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 1344
                             Buffers: shared hit=64441 read=2922 dirtied=396 written=30
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.062..0.062 rows=1 loops=2016)
                       Buffers: shared hit=64441 read=2922 dirtied=396 written=30
                       ->  Index Only Scan using lineitem_l_partkey_l_quantity_idx on lineitem lineitem_1  (cost=0.56..9.11 rows=31 width=4) (actual time=0.031..0.056 rows=30 loops=2016)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 1344
                             Buffers: shared hit=64441 read=2922 dirtied=396 written=30
 Planning time: 3.301 ms
 Execution time: 229.384 ms
(30 rows)

COMMIT;
COMMIT