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 '1996-11-01'
	and l_shipdate < cast(date '1996-11-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1181318.19..1181318.20 rows=1 width=29) (actual time=7956.795..7956.796 rows=1 loops=1)
   Buffers: shared hit=951 read=446503
   ->  Hash Join  (cost=102341.58..1167446.65 rows=792659 width=29) (actual time=1637.899..7613.713 rows=749835 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=951 read=446503
         ->  Bitmap Heap Scan on lineitem  (cost=16819.58..1064089.83 rows=792659 width=12) (actual time=372.331..5243.132 rows=749835 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-11-01'::date) AND (l_shipdate < '1996-12-01'::date))
               Buffers: shared hit=946 read=405983
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16621.42 rows=792659 width=0) (actual time=245.367..245.367 rows=749835 loops=1)
                     Index Cond: ((l_shipdate >= '1996-11-01'::date) AND (l_shipdate < '1996-12-01'::date))
                     Buffers: shared hit=561 read=1491
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1263.764..1263.764 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=0.018..740.757 rows=2000000 loops=1)
                     Buffers: shared hit=2 read=40520
 Total runtime: 7965.320 ms
(17 rows)

COMMIT;
COMMIT