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 '1996-11-01'
	and l_shipdate < cast(date '1996-11-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1166753.21..1166753.23 rows=1 width=29) (actual time=35168.013..35168.013 rows=1 loops=1)
   Buffers: shared hit=234760 read=217948 written=4
   ->  Hash Join  (cost=101171.62..1153759.18 rows=742516 width=29) (actual time=5326.904..34393.619 rows=749402 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=234760 read=217948 written=4
         ->  Bitmap Heap Scan on lineitem  (cost=15649.62..1051530.57 rows=742516 width=12) (actual time=1076.016..26238.786 rows=749402 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-11-01'::date) AND (l_shipdate < '1996-12-01'::date))
               Buffers: shared hit=194242 read=217941 written=4
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15463.99 rows=742516 width=0) (actual time=860.468..860.468 rows=759392 loops=1)
                     Index Cond: ((l_shipdate >= '1996-11-01'::date) AND (l_shipdate < '1996-12-01'::date))
                     Buffers: shared read=2052
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=4248.966..4248.966 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=40515 read=7
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.023..2067.380 rows=2000000 loops=1)
                     Buffers: shared hit=40515 read=7
 Total runtime: 35190.473 ms
(17 rows)

COMMIT;
COMMIT