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 '1993-10-01'
	and l_shipdate < cast(date '1993-10-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1188424.26..1188424.28 rows=1 width=29) (actual time=13166.610..13166.611 rows=1 loops=1)
   Buffers: shared hit=193804 read=263491 written=6840
   ->  Hash Join  (cost=102375.15..1174474.94 rows=797104 width=29) (actual time=3808.873..12656.397 rows=773281 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=193804 read=263491 written=6840
         ->  Bitmap Heap Scan on lineitem  (cost=16853.15..1071018.10 rows=797104 width=12) (actual time=755.720..6687.167 rows=773281 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-10-01'::date) AND (l_shipdate < '1993-11-01'::date))
               Buffers: shared hit=153279 read=263491 written=6840
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16653.87 rows=797104 width=0) (actual time=525.780..525.780 rows=778589 loops=1)
                     Index Cond: ((l_shipdate >= '1993-10-01'::date) AND (l_shipdate < '1993-11-01'::date))
                     Buffers: shared hit=257 read=1859 written=207
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=3050.895..3050.895 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=40522
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.014..831.586 rows=2000000 loops=1)
                     Buffers: shared hit=40522
 Total runtime: 13183.704 ms
(17 rows)

COMMIT;
COMMIT