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#13'
	and p_container = 'WRAP PKG'
	and l_quantity < (
		select
			0.2 * avg(l_quantity)
		from
			lineitem
		where
			l_partkey = p_partkey
	);
                                                                                               QUERY PLAN                                                                                               
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=352889.66..352889.67 rows=1 width=4) (actual time=704.055..704.055 rows=1 loops=1)
   Buffers: shared hit=62839 read=25739 dirtied=197 written=46
   ->  Nested Loop  (cost=130.19..352839.62 rows=20014 width=4) (actual time=1.330..703.114 rows=5631 loops=1)
         Buffers: shared hit=62839 read=25739 dirtied=197 written=46
         ->  Index Only Scan using part_p_container_p_brand_p_partkey_idx on part  (cost=0.43..7844.90 rows=1986 width=4) (actual time=0.144..32.218 rows=2100 loops=1)
               Index Cond: ((p_container = 'WRAP PKG'::bpchar) AND (p_brand = 'Brand#13'::bpchar))
               Heap Fetches: 2100
               Buffers: shared hit=333 read=1738 written=1
         ->  Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem  (cost=129.76..173.61 rows=10 width=12) (actual time=0.005..0.006 rows=3 loops=2100)
               Index Cond: ((l_partkey = part.p_partkey) AND (l_quantity < (SubPlan 1)))
               Buffers: shared hit=14078
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.309..0.310 rows=1 loops=2100)
                       Buffers: shared hit=48428 read=24001 dirtied=197 written=45
                       ->  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=0.034..0.302 rows=30 loops=2100)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 63689
                             Buffers: shared hit=48428 read=24001 dirtied=197 written=45
               SubPlan 1
                 ->  Aggregate  (cost=129.19..129.20 rows=1 width=4) (actual time=0.309..0.310 rows=1 loops=2100)
                       Buffers: shared hit=48428 read=24001 dirtied=197 written=45
                       ->  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=0.034..0.302 rows=30 loops=2100)
                             Index Cond: (l_partkey = part.p_partkey)
                             Heap Fetches: 63689
                             Buffers: shared hit=48428 read=24001 dirtied=197 written=45
 Planning time: 3.617 ms
 Execution time: 704.288 ms
(27 rows)

COMMIT;
COMMIT