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 '1996-03-01'
	and l_shipdate < cast(date '1996-03-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1170143.40..1170143.41 rows=1 width=29) (actual time=14557.520..14557.520 rows=1 loops=1)
   Buffers: shared hit=145042 read=314182
   ->  Hash Join  (cost=101350.51..1157007.84 rows=750603 width=29) (actual time=3552.088..13948.359 rows=772419 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=145042 read=314182
         ->  Bitmap Heap Scan on lineitem  (cost=15828.51..1054597.28 rows=750603 width=12) (actual time=748.807..7724.509 rows=772419 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-03-01'::date) AND (l_shipdate < '1996-04-01'::date))
               Buffers: shared hit=137238 read=281461
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15640.86 rows=750603 width=0) (actual time=552.397..552.397 rows=781882 loops=1)
                     Index Cond: ((l_shipdate >= '1996-03-01'::date) AND (l_shipdate < '1996-04-01'::date))
                     Buffers: shared read=2114
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2801.275..2801.275 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=7801 read=32721
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.016..1425.942 rows=2000000 loops=1)
                     Buffers: shared hit=7801 read=32721
 Total runtime: 14581.301 ms
(17 rows)

COMMIT;
COMMIT