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 '1995-11-01'
	and l_shipdate < cast(date '1995-11-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1162585.48..1162585.50 rows=1 width=29) (actual time=23387.256..23387.256 rows=1 loops=1)
   Buffers: shared hit=172392 read=276553
   ->  Hash Join  (cost=101329.18..1149520.49 rows=746571 width=29) (actual time=6384.735..22676.432 rows=748736 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=172392 read=276553
         ->  Bitmap Heap Scan on lineitem  (cost=15807.18..1047200.64 rows=746571 width=12) (actual time=980.432..13941.149 rows=748736 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-11-01'::date) AND (l_shipdate < '1995-12-01'::date))
               Buffers: shared hit=161256 read=247164
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15620.54 rows=746571 width=0) (actual time=779.566..779.566 rows=751672 loops=1)
                     Index Cond: ((l_shipdate >= '1995-11-01'::date) AND (l_shipdate < '1995-12-01'::date))
                     Buffers: shared hit=2 read=2046
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=5402.476..5402.476 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=11133 read=29389
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.021..3190.122 rows=2000000 loops=1)
                     Buffers: shared hit=11133 read=29389
 Total runtime: 23414.315 ms
(17 rows)

COMMIT;
COMMIT