BEGIN;
BEGIN
create or replace view revenue20 (supplier_no, total_revenue) as
	select
		l_suppkey,
		sum(l_extendedprice * (1 - l_discount))
	from
		lineitem
	where
		l_shipdate >= '1994-04-01'
		and l_shipdate < date'1994-04-01' + interval '90 days'
	group by
		l_suppkey;
CREATE VIEW
EXPLAIN (ANALYZE, BUFFERS)
select
	s_suppkey,
	s_name,
	s_address,
	s_phone,
	total_revenue
from
	supplier,
	revenue20
where
	s_suppkey = supplier_no
	and total_revenue = (
		select
			max(total_revenue)
		from
			revenue20
	)
order by
	s_suppkey;
                                                                                      QUERY PLAN                                                                                       
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Merge Join  (cost=2358316.87..2363413.92 rows=3723 width=79) (actual time=15169.339..15169.343 rows=1 loops=1)
   Merge Cond: (supplier.s_suppkey = revenue20.supplier_no)
   Buffers: shared hit=971469 read=347166 written=3033
   InitPlan 1 (returns $0)
     ->  Aggregate  (cost=1170655.61..1170655.62 rows=1 width=8) (actual time=7906.170..7906.170 rows=1 loops=1)
           Buffers: shared hit=396604 read=262153 written=28
           ->  HashAggregate  (cost=1170571.84..1170609.07 rows=3723 width=12) (actual time=7863.331..7895.942 rows=100000 loops=1)
                 Group Key: lineitem_1.l_suppkey
                 Buffers: shared hit=396604 read=262153 written=28
                 ->  Bitmap Heap Scan on lineitem lineitem_1  (cost=47447.42..1148192.47 rows=2237937 width=12) (actual time=1153.126..5989.939 rows=2243279 loops=1)
                       Recheck Cond: ((l_shipdate >= '1994-04-01'::date) AND (l_shipdate < '1994-06-30 00:00:00'::timestamp without time zone))
                       Heap Blocks: exact=652623
                       Buffers: shared hit=396604 read=262153 written=28
                       ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..46887.93 rows=2237937 width=0) (actual time=898.329..898.329 rows=2247936 loops=1)
                             Index Cond: ((l_shipdate >= '1994-04-01'::date) AND (l_shipdate < '1994-06-30 00:00:00'::timestamp without time zone))
                             Buffers: shared read=6134 written=2
   ->  Index Scan using pk_supplier on supplier  (cost=0.29..4791.49 rows=100000 width=71) (actual time=0.028..14.169 rows=40970 loops=1)
         Buffers: shared hit=1121
   ->  Sort  (cost=1187660.96..1187670.26 rows=3723 width=12) (actual time=15151.246..15151.249 rows=1 loops=1)
         Sort Key: revenue20.supplier_no
         Sort Method: quicksort  Memory: 25kB
         Buffers: shared hit=970348 read=347166 written=3033
         ->  Subquery Scan on revenue20  (cost=1187356.37..1187440.14 rows=3723 width=12) (actual time=15143.856..15151.213 rows=1 loops=1)
               Buffers: shared hit=970348 read=347166 written=3033
               ->  HashAggregate  (cost=1187356.37..1187402.91 rows=3723 width=12) (actual time=15143.854..15151.209 rows=1 loops=1)
                     Group Key: lineitem.l_suppkey
                     Filter: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))) = $0)
                     Rows Removed by Filter: 99999
                     Buffers: shared hit=970348 read=347166 written=3033
                     ->  Bitmap Heap Scan on lineitem  (cost=47447.42..1148192.47 rows=2237937 width=12) (actual time=1227.161..5397.739 rows=2243279 loops=1)
                           Recheck Cond: ((l_shipdate >= '1994-04-01'::date) AND (l_shipdate < '1994-06-30 00:00:00'::timestamp without time zone))
                           Heap Blocks: exact=652623
                           Buffers: shared hit=573744 read=85013 written=3005
                           ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..46887.93 rows=2237937 width=0) (actual time=963.208..963.208 rows=2247265 loops=1)
                                 Index Cond: ((l_shipdate >= '1994-04-01'::date) AND (l_shipdate < '1994-06-30 00:00:00'::timestamp without time zone))
                                 Buffers: shared hit=383 read=5751 written=194
 Planning time: 2.615 ms
 Execution time: 15175.363 ms
(38 rows)

drop view revenue20;
DROP VIEW
COMMIT;
COMMIT