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 '1995-12-01'
	and l_shipdate < cast(date '1995-12-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1185405.77..1185405.78 rows=1 width=29) (actual time=16338.562..16338.562 rows=1 loops=1)
   Buffers: shared hit=75356 read=383994 dirtied=513 written=15
   ->  Hash Join  (cost=101980.36..1171741.21 rows=780832 width=29) (actual time=4184.827..15740.804 rows=772407 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=75356 read=383994 dirtied=513 written=15
         ->  Bitmap Heap Scan on lineitem  (cost=16458.36..1068650.49 rows=780832 width=12) (actual time=808.293..8553.000 rows=772407 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-12-01'::date) AND (l_shipdate < '1996-01-01'::date))
               Buffers: shared hit=75351 read=343474 dirtied=513 written=15
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16263.15 rows=780832 width=0) (actual time=573.660..573.660 rows=782561 loops=1)
                     Index Cond: ((l_shipdate >= '1995-12-01'::date) AND (l_shipdate < '1996-01-01'::date))
                     Buffers: shared read=2113
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=3374.748..3374.748 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=0.010..1397.365 rows=2000000 loops=1)
                     Buffers: shared hit=2 read=40520
 Total runtime: 16370.496 ms
(17 rows)

COMMIT;
COMMIT