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 '1996-08-01'
	and l_shipdate < cast(date '1996-08-01' + interval '1 month' as date);
                                                                                  QUERY PLAN                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1159334.56..1159334.58 rows=1 width=29) (actual time=25456.856..25456.857 rows=1 loops=1)
   Buffers: shared hit=567530 read=545376 written=6941
   ->  Hash Join  (cost=93526.23..1145921.50 rows=766461 width=29) (actual time=1825.065..25002.196 rows=772370 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=567530 read=545376 written=6941
         ->  Bitmap Heap Scan on lineitem  (cost=8004.23..1048902.58 rows=766461 width=12) (actual time=127.132..22432.196 rows=772370 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-08-01'::date) AND (l_shipdate < '1996-09-01'::date))
               Rows Removed by Index Recheck: 59213317
               Heap Blocks: lossy=1072333
               Buffers: shared hit=567525 read=504856 written=4864
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey_brin_idx  (cost=0.00..7812.61 rows=766461 width=0) (actual time=126.169..126.169 rows=10723840 loops=1)
                     Index Cond: ((l_shipdate >= '1996-08-01'::date) AND (l_shipdate < '1996-09-01'::date))
                     Buffers: shared hit=13 read=35
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1688.852..1688.852 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=2 read=40520 written=2077
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.012..967.036 rows=2000000 loops=1)
                     Buffers: shared hit=2 read=40520 written=2077
 Planning time: 2.392 ms
 Execution time: 25458.052 ms
(20 rows)

COMMIT;
COMMIT