BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	100.00 * sum(case
		when p_type like 'PROMO%'
			then l_extendedprice * (1 - l_discount)
		else 0
	end) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue
from
	lineitem,
	part
where
	l_partkey = p_partkey
	and l_shipdate >= date '1995-02-01'
	and l_shipdate < cast(date '1995-02-01' + interval '1 month' as date);
                                                                                QUERY PLAN                                                                                 
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1146382.89..1146382.90 rows=1 width=29) (actual time=9356.604..9356.604 rows=1 loops=1)
   Buffers: shared hit=192055 read=241936 dirtied=326 written=94
   ->  Hash Join  (cost=100911.97..1133664.39 rows=726771 width=29) (actual time=4440.262..8985.669 rows=698204 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=192055 read=241936 dirtied=326 written=94
         ->  Bitmap Heap Scan on lineitem  (cost=15389.97..1037240.83 rows=726771 width=12) (actual time=2843.894..6707.427 rows=698204 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-02-01'::date) AND (l_shipdate < '1995-03-01'::date))
               Heap Blocks: exact=391556
               Buffers: shared hit=181554 read=211912 dirtied=326 written=94
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15208.27 rows=726771 width=0) (actual time=2651.422..2651.422 rows=700269 loops=1)
                     Index Cond: ((l_shipdate >= '1995-02-01'::date) AND (l_shipdate < '1995-03-01'::date))
                     Buffers: shared hit=2 read=1908
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1584.139..1584.139 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=10498 read=30024
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.014..879.077 rows=2000000 loops=1)
                     Buffers: shared hit=10498 read=30024
 Planning time: 3.083 ms
 Execution time: 9363.458 ms
(19 rows)

COMMIT;
COMMIT