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 '1996-09-01'
	and l_shipdate < cast(date '1996-09-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1177524.34..1177524.36 rows=1 width=29) (actual time=12421.893..12421.894 rows=1 loops=1)
   Buffers: shared hit=267037 read=186482 dirtied=834 written=108
   ->  Hash Join  (cost=101630.07..1164150.51 rows=764219 width=29) (actual time=3548.046..11862.227 rows=750330 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=267037 read=186482 dirtied=834 written=108
         ->  Bitmap Heap Scan on lineitem  (cost=16108.07..1061433.58 rows=764219 width=12) (actual time=915.432..6425.939 rows=750330 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-09-01'::date) AND (l_shipdate < '1996-10-01'::date))
               Buffers: shared hit=254309 read=158685 dirtied=834 written=108
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15917.02 rows=764219 width=0) (actual time=503.917..503.917 rows=760104 loops=1)
                     Index Cond: ((l_shipdate >= '1996-09-01'::date) AND (l_shipdate < '1996-10-01'::date))
                     Buffers: shared read=2053
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2630.073..2630.073 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=12725 read=27797
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.027..1470.561 rows=2000000 loops=1)
                     Buffers: shared hit=12725 read=27797
 Total runtime: 12440.210 ms
(17 rows)

COMMIT;
COMMIT