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 '1993-07-01'
	and l_shipdate < cast(date '1993-07-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1183952.26..1183952.27 rows=1 width=29) (actual time=8338.891..8338.891 rows=1 loops=1)
   Buffers: shared hit=224294 read=233005 dirtied=567 written=44
   ->  Hash Join  (cost=102531.88..1169881.72 rows=804031 width=29) (actual time=2164.783..7923.733 rows=773985 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=224294 read=233005 dirtied=567 written=44
         ->  Bitmap Heap Scan on lineitem  (cost=17009.88..1072299.25 rows=804031 width=12) (actual time=604.447..5265.498 rows=773985 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-07-01'::date) AND (l_shipdate < '1993-08-01'::date))
               Heap Blocks: exact=414657
               Buffers: shared hit=198848 read=217926 dirtied=567 written=44
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16808.88 rows=804031 width=0) (actual time=420.075..420.075 rows=777890 loops=1)
                     Index Cond: ((l_shipdate >= '1993-07-01'::date) AND (l_shipdate < '1993-08-01'::date))
                     Buffers: shared read=2117
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1547.292..1547.292 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=25443 read=15079
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.011..831.622 rows=2000000 loops=1)
                     Buffers: shared hit=25443 read=15079
 Planning time: 4.630 ms
 Execution time: 8346.972 ms
(19 rows)

COMMIT;
COMMIT