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 '1993-07-01'
	and l_shipdate < cast(date '1993-07-01' + interval '1 month' as date);
                                                                               QUERY PLAN                                                                                
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1170448.12..1170448.14 rows=1 width=29) (actual time=6391.137..6391.137 rows=1 loops=1)
   Buffers: shared hit=166220 read=290648
   ->  Hash Join  (cost=101927.04..1156884.38 rows=775071 width=29) (actual time=1842.318..6023.952 rows=773182 loops=1)
         Hash Cond: (lineitem.l_partkey = part.p_partkey)
         Buffers: shared hit=166220 read=290648
         ->  Bitmap Heap Scan on lineitem  (cost=16405.04..1059736.32 rows=775071 width=12) (actual time=420.701..3969.515 rows=773182 loops=1)
               Recheck Cond: ((l_shipdate >= '1993-07-01'::date) AND (l_shipdate < '1993-08-01'::date))
               Heap Blocks: exact=414226
               Buffers: shared hit=162765 read=253578
               ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..16211.27 rows=775071 width=0) (actual time=266.289..266.289 rows=777087 loops=1)
                     Index Cond: ((l_shipdate >= '1993-07-01'::date) AND (l_shipdate < '1993-08-01'::date))
                     Buffers: shared read=2117
         ->  Hash  (cost=60522.00..60522.00 rows=2000000 width=25) (actual time=1410.224..1410.224 rows=2000000 loops=1)
               Buckets: 2097152  Batches: 1  Memory Usage: 131903kB
               Buffers: shared hit=3452 read=37070
               ->  Seq Scan on part  (cost=0.00..60522.00 rows=2000000 width=25) (actual time=0.018..795.004 rows=2000000 loops=1)
                     Buffers: shared hit=3452 read=37070
 Planning time: 2.513 ms
 Execution time: 6397.585 ms
(19 rows)

COMMIT;
COMMIT