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 '1993-04-01'
	and l_shipdate < cast(date '1993-04-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1159226.24..1159226.26 rows=1 width=29) (actual time=11141.333..11141.334 rows=1 loops=1)
   Buffers: shared hit=118349 read=332659
   ->  Hash Join  (cost=101079.05..1146349.29 rows=735826 width=29) (actual time=2149.675..10679.323 rows=749855 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=118349 read=332659
         ->  Bitmap Heap Scan on lineitem  (cost=15557.05..1044271.20 rows=735826 width=12) (actual time=767.867..6695.123 rows=749855 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-04-01'::date) AND (l_shipdate < '1993-05-01'::date))
               Buffers: shared hit=77831 read=332652
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15373.09 rows=735826 width=0) (actual time=553.580..553.580 rows=755089 loops=1)
                     Index Cond: ((l_shipdate >= '1993-04-01'::date) AND (l_shipdate < '1993-05-01'::date))
                     Buffers: shared hit=3 read=2049
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1380.100..1380.100 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=40515 read=7
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.012..702.318 rows=2000000 loops=1)
                     Buffers: shared hit=40515 read=7
 Total runtime: 11152.516 ms
(17 rows)

COMMIT;
COMMIT