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 '1996-06-01'
	and l_shipdate < cast(date '1996-06-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1177820.77..1177820.79 rows=1 width=29) (actual time=13090.037..13090.037 rows=1 loops=1)
   Buffers: shared hit=181540 read=268917 dirtied=169 written=2
   ->  Hash Join  (cost=101924.05..1164252.34 rows=775339 width=29) (actual time=2815.783..12504.430 rows=749793 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=181540 read=268917 dirtied=169 written=2
         ->  Bitmap Heap Scan on lineitem  (cost=16402.05..1061285.21 rows=775339 width=12) (actual time=708.004..7720.239 rows=749793 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-06-01'::date) AND (l_shipdate < '1996-07-01'::date))
               Buffers: shared hit=141631 read=268301 dirtied=169 written=2
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16208.22 rows=775339 width=0) (actual time=452.962..452.962 rows=754107 loops=1)
                     Index Cond: ((l_shipdate >= '1996-06-01'::date) AND (l_shipdate < '1996-07-01'::date))
                     Buffers: shared hit=2 read=2049
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2106.010..2106.010 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=39906 read=616
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.019..1075.955 rows=2000000 loops=1)
                     Buffers: shared hit=39906 read=616
 Total runtime: 13105.555 ms
(17 rows)

COMMIT;
COMMIT