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 '1993-02-01'
	and l_shipdate < cast(date '1993-02-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1141169.74..1141169.75 rows=1 width=29) (actual time=6193.191..6193.192 rows=1 loops=1)
   Buffers: shared hit=161124 read=273026
   ->  Hash Join  (cost=100733.85..1128605.10 rows=717979 width=29) (actual time=1503.749..5852.510 rows=699884 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=161124 read=273026
         ->  Bitmap Heap Scan on lineitem  (cost=15211.85..1032313.42 rows=717979 width=12) (actual time=383.148..4117.625 rows=699884 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-02-01'::date) AND (l_shipdate < '1993-03-01'::date))
               Heap Blocks: exact=391709
               Buffers: shared hit=120599 read=273026
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..15032.36 rows=717979 width=0) (actual time=239.346..239.346 rows=701953 loops=1)
                     Index Cond: ((l_shipdate >= '1993-02-01'::date) AND (l_shipdate < '1993-03-01'::date))
                     Buffers: shared read=1916
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1110.494..1110.494 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=40522
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.021..520.730 rows=2000000 loops=1)
                     Buffers: shared hit=40522
 Planning time: 2.282 ms
 Execution time: 6199.682 ms
(19 rows)

COMMIT;
COMMIT