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 '1995-08-01'
	and l_shipdate < cast(date '1995-08-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1170919.53..1170919.55 rows=1 width=29) (actual time=6579.025..6579.025 rows=1 loops=1)
   Buffers: shared hit=241143 read=217131
   ->  Hash Join  (cost=101786.23..1157445.95 rows=769919 width=29) (actual time=1891.571..6216.025 rows=773101 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=241143 read=217131
         ->  Bitmap Heap Scan on lineitem  (cost=16264.23..1060375.17 rows=769919 width=12) (actual time=402.798..4067.016 rows=773101 loops=1)
               Recheck Cond: ((l_shipdate >= '1995-08-01'::date) AND (l_shipdate < '1995-09-01'::date))
               Heap Blocks: exact=415633
               Buffers: shared hit=228679 read=189070
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16071.76 rows=769919 width=0) (actual time=263.869..263.869 rows=780185 loops=1)
                     Index Cond: ((l_shipdate >= '1995-08-01'::date) AND (l_shipdate < '1995-09-01'::date))
                     Buffers: shared read=2116
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1477.359..1477.359 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=12461 read=28061
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.014..828.127 rows=2000000 loops=1)
                     Buffers: shared hit=12461 read=28061
 Planning time: 2.308 ms
 Execution time: 6582.852 ms
(19 rows)

COMMIT;
COMMIT