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 '1994-03-01'
	and l_shipdate < cast(date '1994-03-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1162473.63..1162473.65 rows=1 width=29) (actual time=7185.670..7185.670 rows=1 loops=1)
   Buffers: shared hit=253116 read=201798 written=1
   ->  Hash Join  (cost=101685.71..1149130.70 rows=762453 width=29) (actual time=1860.010..6799.686 rows=773569 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=253116 read=201798 written=1
         ->  Bitmap Heap Scan on lineitem  (cost=16163.71..1052171.91 rows=762453 width=12) (actual time=480.802..4297.788 rows=773569 loops=1)
               Recheck Cond: ((l_shipdate >= '1994-03-01'::date) AND (l_shipdate < '1994-04-01'::date))
               Heap Blocks: exact=412274
               Buffers: shared hit=212597 read=201792 written=1
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15973.09 rows=762453 width=0) (actual time=321.790..321.790 rows=774384 loops=1)
                     Index Cond: ((l_shipdate >= '1994-03-01'::date) AND (l_shipdate < '1994-04-01'::date))
                     Buffers: shared read=2115
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1364.985..1364.985 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=40516 read=6
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.013..670.837 rows=2000000 loops=1)
                     Buffers: shared hit=40516 read=6
 Planning time: 2.836 ms
 Execution time: 7190.931 ms
(19 rows)

COMMIT;
COMMIT