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 '1993-12-01'
	and l_shipdate < cast(date '1993-12-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1177400.21..1177400.22 rows=1 width=29) (actual time=5581.783..5581.783 rows=1 loops=1)
   Buffers: shared hit=348807 read=108847
   ->  Hash Join  (cost=102083.41..1163678.77 rows=784082 width=29) (actual time=2005.527..5221.777 rows=772803 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=348807 read=108847
         ->  Bitmap Heap Scan on lineitem  (cost=16561.41..1066395.54 rows=784082 width=12) (actual time=470.815..3056.776 rows=772803 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-12-01'::date) AND (l_shipdate < '1994-01-01'::date))
               Heap Blocks: exact=415016
               Buffers: shared hit=342928 read=74201
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16365.39 rows=784082 width=0) (actual time=304.286..304.286 rows=778907 loops=1)
                     Index Cond: ((l_shipdate >= '1993-12-01'::date) AND (l_shipdate < '1994-01-01'::date))
                     Buffers: shared read=2113
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1523.108..1523.108 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=5876 read=34646
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.022..864.111 rows=2000000 loops=1)
                     Buffers: shared hit=5876 read=34646
 Planning time: 3.262 ms
 Execution time: 5588.472 ms
(19 rows)

COMMIT;
COMMIT