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 '1995-06-01'
	and l_shipdate < cast(date '1995-06-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1166573.31..1166573.32 rows=1 width=29) (actual time=10790.399..10790.400 rows=1 loops=1)
   Buffers: shared hit=121852 read=330461
   ->  Hash Join  (cost=101201.69..1153562.08 rows=743499 width=29) (actual time=2212.679..10340.765 rows=747375 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=121852 read=330461
         ->  Bitmap Heap Scan on lineitem  (cost=15679.69..1051311.35 rows=743499 width=12) (actual time=449.643..6183.445 rows=747375 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-06-01'::date) AND (l_shipdate < '1995-07-01'::date))
               Buffers: shared hit=81327 read=330461
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15493.82 rows=743499 width=0) (actual time=293.034..293.034 rows=757355 loops=1)
                     Index Cond: ((l_shipdate >= '1995-06-01'::date) AND (l_shipdate < '1995-07-01'::date))
                     Buffers: shared hit=2046 read=2
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1760.912..1760.912 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=40522
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.017..921.062 rows=2000000 loops=1)
                     Buffers: shared hit=40522
 Total runtime: 10801.708 ms
(17 rows)

COMMIT;
COMMIT