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 '1993-08-01'
	and l_shipdate < cast(date '1993-08-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1186835.20..1186835.21 rows=1 width=29) (actual time=13662.068..13662.069 rows=1 loops=1)
   Buffers: shared hit=153658 read=306621 dirtied=391
   ->  Hash Join  (cost=102044.00..1173116.61 rows=783919 width=29) (actual time=3547.919..13110.121 rows=774371 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=153658 read=306621 dirtied=391
         ->  Bitmap Heap Scan on lineitem  (cost=16522.00..1069956.44 rows=783919 width=12) (actual time=866.582..7844.988 rows=774371 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-08-01'::date) AND (l_shipdate < '1993-09-01'::date))
               Buffers: shared hit=153653 read=266101 dirtied=391
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16326.02 rows=783919 width=0) (actual time=623.344..623.344 rows=784274 loops=1)
                     Index Cond: ((l_shipdate >= '1993-08-01'::date) AND (l_shipdate < '1993-09-01'::date))
                     Buffers: shared read=2118
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2679.166..2679.166 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=2 read=40520
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.011..1555.737 rows=2000000 loops=1)
                     Buffers: shared hit=2 read=40520
 Total runtime: 13672.272 ms
(17 rows)

COMMIT;
COMMIT