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 '1994-11-01'
	and l_shipdate < cast(date '1994-11-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1166491.96..1166491.98 rows=1 width=29) (actual time=7508.753..7508.754 rows=1 loops=1)
   Buffers: shared hit=248896 read=202266 dirtied=84 written=6808
   ->  Hash Join  (cost=101546.70..1153208.80 rows=759038 width=29) (actual time=2321.488..7137.070 rows=746421 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=248896 read=202266 dirtied=84 written=6808
         ->  Bitmap Heap Scan on lineitem  (cost=16024.70..1056301.23 rows=759038 width=12) (actual time=641.595..4759.180 rows=746421 loops=1)
               Recheck Cond: ((l_shipdate >= '1994-11-01'::date) AND (l_shipdate < '1994-12-01'::date))
               Heap Blocks: exact=408593
               Buffers: shared hit=241391 read=169246 dirtied=84 written=6737
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15834.95 rows=759038 width=0) (actual time=416.888..416.888 rows=754011 loops=1)
                     Index Cond: ((l_shipdate >= '1994-11-01'::date) AND (l_shipdate < '1994-12-01'::date))
                     Buffers: shared read=2044 written=3
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1666.642..1666.642 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=7502 read=33020 written=71
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.013..958.225 rows=2000000 loops=1)
                     Buffers: shared hit=7502 read=33020 written=71
 Planning time: 3.082 ms
 Execution time: 7511.764 ms
(19 rows)

COMMIT;
COMMIT