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 '1993-02-01'
	and l_shipdate < cast(date '1993-02-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1148875.63..1148875.65 rows=1 width=29) (actual time=11377.889..11377.889 rows=1 loops=1)
   Buffers: shared hit=141679 read=296317
   ->  Hash Join  (cost=100493.73..1136451.65 rows=709942 width=29) (actual time=2851.970..10920.295 rows=700490 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=141679 read=296317
         ->  Bitmap Heap Scan on lineitem  (cost=14971.73..1034955.95 rows=709942 width=12) (actual time=744.328..6379.027 rows=700490 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-02-01'::date) AND (l_shipdate < '1993-03-01'::date))
               Buffers: shared hit=126838 read=270633
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..14794.25 rows=709942 width=0) (actual time=517.959..517.959 rows=708791 loops=1)
                     Index Cond: ((l_shipdate >= '1993-02-01'::date) AND (l_shipdate < '1993-03-01'::date))
                     Buffers: shared read=1917
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2105.936..2105.936 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=14838 read=25684
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.012..1099.402 rows=2000000 loops=1)
                     Buffers: shared hit=14838 read=25684
 Total runtime: 11397.443 ms
(17 rows)

COMMIT;
COMMIT