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 = 'WRAP CAN'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                        QUERY PLAN                                                                                         
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=116041.04..116041.06 rows=1 width=4) (actual time=211.394..211.394 rows=1 loops=1)
   Buffers: shared hit=74371 read=6737 dirtied=203
   ->  Nested Loop  (cost=83.05..115989.93 rows=20447 width=4) (actual time=1.653..210.079 rows=5393 loops=1)
         Buffers: shared hit=74371 read=6737 dirtied=203
         ->  Bitmap Heap Scan on part  (cost=73.29..6728.81 rows=2035 width=4) (actual time=1.251..34.563 rows=2017 loops=1)
               Recheck Cond: ((p_container = 'WRAP CAN'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
               Heap Blocks: exact=1981
               Buffers: shared hit=1 read=1995
               ->  Bitmap Index Scan on part_p_container_p_brand_p_partkey_idx  (cost=0.00..72.78 rows=2035 width=0) (actual time=0.910..0.910 rows=2017 loops=1)
                     Index Cond: ((p_container = 'WRAP CAN'::bpchar) AND (p_brand = 'Brand#51'::bpchar))
                     Buffers: shared hit=1 read=14
         ->  Index Scan using lineitem_l_partkey_l_quantity_idx on lineitem  (cost=9.76..53.59 rows=10 width=12) (actual time=0.016..0.039 rows=3 loops=2017)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=11034 read=2448
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.045..0.045 rows=1 loops=2017)
                       Buffers: shared hit=63336 read=2294 dirtied=203
                       ->  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=0.023..0.040 rows=30 loops=2017)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 522
                             Buffers: shared hit=63336 read=2294 dirtied=203
               SubPlan 1
                 ->  Aggregate  (cost=9.19..9.20 rows=1 width=4) (actual time=0.045..0.045 rows=1 loops=2017)
                       Buffers: shared hit=63336 read=2294 dirtied=203
                       ->  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=0.023..0.040 rows=30 loops=2017)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 522
                             Buffers: shared hit=63336 read=2294 dirtied=203
 Planning time: 2.433 ms
 Execution time: 211.560 ms
(30 rows)

COMMIT;
COMMIT