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 '1993-11-01'
	and l_shipdate < cast(date '1993-11-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1158038.38..1158038.40 rows=1 width=29) (actual time=8855.781..8855.781 rows=1 loops=1)
   Buffers: shared hit=157865 read=290602 dirtied=305 written=632
   ->  Hash Join  (cost=101485.70..1144859.38 rows=753086 width=29) (actual time=2444.084..8469.386 rows=749034 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=157865 read=290602 dirtied=305 written=632
         ->  Bitmap Heap Scan on lineitem  (cost=15963.70..1048041.09 rows=753086 width=12) (actual time=526.330..5284.462 rows=749034 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-11-01'::date) AND (l_shipdate < '1993-12-01'::date))
               Heap Blocks: exact=405892
               Buffers: shared hit=157859 read=250083 dirtied=305 written=616
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15775.43 rows=753086 width=0) (actual time=330.648..330.648 rows=750368 loops=1)
                     Index Cond: ((l_shipdate >= '1993-11-01'::date) AND (l_shipdate < '1993-12-01'::date))
                     Buffers: shared read=2050
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1899.129..1899.129 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=3 read=40519 written=16
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.014..1017.126 rows=2000000 loops=1)
                     Buffers: shared hit=3 read=40519 written=16
 Planning time: 3.616 ms
 Execution time: 8866.196 ms
(19 rows)

COMMIT;
COMMIT