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 '1996-03-01'
	and l_shipdate < cast(date '1996-03-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1188057.66..1188057.68 rows=1 width=29) (actual time=15176.239..15176.239 rows=1 loops=1)
   Buffers: shared hit=236486 read=220286 written=243
   ->  Hash Join  (cost=102399.70..1174093.73 rows=797939 width=29) (actual time=2985.589..14507.596 rows=772637 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=236486 read=220286 written=243
         ->  Bitmap Heap Scan on lineitem  (cost=16877.70..1070618.10 rows=797939 width=12) (actual time=758.535..9364.029 rows=772637 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-03-01'::date) AND (l_shipdate < '1996-04-01'::date))
               Buffers: shared hit=218119 read=198128 written=230
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16678.22 rows=797939 width=0) (actual time=494.454..494.454 rows=777181 loops=1)
                     Index Cond: ((l_shipdate >= '1996-03-01'::date) AND (l_shipdate < '1996-04-01'::date))
                     Buffers: shared hit=3 read=2111
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=2225.233..2225.233 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=18364 read=22158 written=13
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.017..1258.998 rows=2000000 loops=1)
                     Buffers: shared hit=18364 read=22158 written=13
 Total runtime: 15196.614 ms
(17 rows)

COMMIT;
COMMIT