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 '1994-06-01'
	and l_shipdate < cast(date '1994-06-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1174533.20..1174533.22 rows=1 width=29) (actual time=42280.526..42280.527 rows=1 loops=1)
   Buffers: shared hit=118707 read=331753 written=11496
   ->  Hash Join  (cost=101750.37..1161104.23 rows=767370 width=29) (actual time=5457.495..41486.896 rows=748332 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=118707 read=331753 written=11496
         ->  Bitmap Heap Scan on lineitem  (cost=16228.37..1058316.40 rows=767370 width=12) (actual time=971.597..33648.050 rows=748332 loops=1)
               Recheck Cond: ((l_shipdate >= '1994-06-01'::date) AND (l_shipdate < '1994-07-01'::date))
               Buffers: shared hit=107904 read=302031 written=8164
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16036.53 rows=767370 width=0) (actual time=694.198..694.198 rows=754047 loops=1)
                     Index Cond: ((l_shipdate >= '1994-06-01'::date) AND (l_shipdate < '1994-07-01'::date))
                     Buffers: shared hit=266 read=1783 written=163
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=4484.087..4484.087 rows=2000000 loops=1)
               Buckets: 262144  Batches: 1  Memory Usage: 115519kB
               Buffers: shared hit=10800 read=29722 written=3332
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.014..3251.229 rows=2000000 loops=1)
                     Buffers: shared hit=10800 read=29722 written=3332
 Total runtime: 42297.056 ms
(17 rows)

COMMIT;
COMMIT