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 '1996-05-01'
	and l_shipdate < cast(date '1996-05-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1167503.55..1167503.56 rows=1 width=29) (actual time=9789.934..9789.935 rows=1 loops=1)
   Buffers: shared hit=225030 read=230754
   ->  Hash Join  (cost=101833.39..1154024.57 rows=770227 width=29) (actual time=3138.089..9378.114 rows=773611 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=225030 read=230754
         ->  Bitmap Heap Scan on lineitem  (cost=16311.39..1056949.17 rows=770227 width=12) (actual time=1221.512..6290.494 rows=773611 loops=1)
               Recheck Cond: ((l_shipdate >= '1996-05-01'::date) AND (l_shipdate < '1996-06-01'::date))
               Heap Blocks: exact=413143
               Buffers: shared hit=225026 read=190233
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16118.84 rows=770227 width=0) (actual time=747.424..747.424 rows=775838 loops=1)
                     Index Cond: ((l_shipdate >= '1996-05-01'::date) AND (l_shipdate < '1996-06-01'::date))
                     Buffers: shared read=2116
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1867.062..1867.062 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=1 read=40521
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.055..1116.411 rows=2000000 loops=1)
                     Buffers: shared hit=1 read=40521
 Planning time: 4.326 ms
 Execution time: 9797.910 ms
(19 rows)

COMMIT;
COMMIT