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 '1997-01-01'
	and l_shipdate < cast(date '1997-01-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1192767.96..1192767.97 rows=1 width=29) (actual time=11553.975..11553.976 rows=1 loops=1)
   Buffers: shared hit=253414 read=204424 dirtied=111
   ->  Hash Join  (cost=102539.50..1178674.61 rows=805334 width=29) (actual time=3045.354..10996.500 rows=773162 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=253414 read=204424 dirtied=111
         ->  Bitmap Heap Scan on lineitem  (cost=17017.50..1075032.60 rows=805334 width=12) (actual time=657.212..5934.853 rows=773162 loops=1)
               Recheck Cond: ((l_shipdate >= '1997-01-01'::date) AND (l_shipdate < '1997-02-01'::date))
               Buffers: shared hit=229430 read=187883 dirtied=111
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16816.17 rows=805334 width=0) (actual time=473.110..473.110 rows=779403 loops=1)
                     Index Cond: ((l_shipdate >= '1997-01-01'::date) AND (l_shipdate < '1997-02-01'::date))
                     Buffers: shared read=2116
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2386.299..2386.299 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=23981 read=16541
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.009..1276.587 rows=2000000 loops=1)
                     Buffers: shared hit=23981 read=16541
 Total runtime: 11564.658 ms
(17 rows)

COMMIT;
COMMIT