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 '1995-11-01'
	and l_shipdate < cast(date '1995-11-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1156058.41..1156058.43 rows=1 width=29) (actual time=7479.652..7479.652 rows=1 loops=1)
   Buffers: shared hit=85061 read=364684 written=58
   ->  Hash Join  (cost=101211.07..1143075.11 rows=741903 width=29) (actual time=1922.298..7104.243 rows=748601 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=85061 read=364684 written=58
         ->  Bitmap Heap Scan on lineitem  (cost=15689.07..1046424.56 rows=741903 width=12) (actual time=391.164..4907.997 rows=748601 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-11-01'::date) AND (l_shipdate < '1995-12-01'::date))
               Heap Blocks: exact=407173
               Buffers: shared hit=85054 read=324166 written=58
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15503.59 rows=741903 width=0) (actual time=241.459..241.459 rows=753110 loops=1)
                     Index Cond: ((l_shipdate >= '1995-11-01'::date) AND (l_shipdate < '1995-12-01'::date))
                     Buffers: shared read=2047
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1518.865..1518.865 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=4 read=40518
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.019..867.134 rows=2000000 loops=1)
                     Buffers: shared hit=4 read=40518
 Planning time: 2.775 ms
 Execution time: 7487.262 ms
(19 rows)

COMMIT;
COMMIT