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 >= '1994-10-01'
		and l_shipdate < date'1994-10-01' + 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=2358014.78..2363111.76 rows=3719 width=79) (actual time=17797.612..17797.617 rows=1 loops=1)
   Merge Cond: (supplier.s_suppkey = revenue20.supplier_no)
   Buffers: shared hit=1055312 read=263570 written=1193
   InitPlan 1 (returns $0)
     ->  Aggregate  (cost=1170511.51..1170511.52 rows=1 width=8) (actual time=9670.380..9670.381 rows=1 loops=1)
           Buffers: shared hit=467455 read=191789 written=42
           ->  HashAggregate  (cost=1170427.83..1170465.02 rows=3719 width=12) (actual time=9588.980..9659.700 rows=100000 loops=1)
                 Group Key: lineitem_1.l_suppkey
                 Buffers: shared hit=467455 read=191789 written=42
                 ->  Bitmap Heap Scan on lineitem lineitem_1  (cost=47408.81..1148066.62 rows=2236121 width=12) (actual time=1642.937..6534.311 rows=2241622 loops=1)
                       Recheck Cond: ((l_shipdate >= '1994-10-01'::date) AND (l_shipdate < '1994-12-30 00:00:00'::timestamp without time zone))
                       Heap Blocks: exact=653115
                       Buffers: shared hit=467455 read=191789 written=42
                       ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..46849.78 rows=2236121 width=0) (actual time=1293.397..1293.397 rows=2246046 loops=1)
                             Index Cond: ((l_shipdate >= '1994-10-01'::date) AND (l_shipdate < '1994-12-30 00:00:00'::timestamp without time zone))
                             Buffers: shared read=6129 written=2
   ->  Index Scan using pk_supplier on supplier  (cost=0.29..4791.49 rows=100000 width=71) (actual time=0.034..5.150 rows=13954 loops=1)
         Buffers: shared hit=394
   ->  Sort  (cost=1187502.96..1187512.26 rows=3719 width=12) (actual time=17791.072..17791.074 rows=1 loops=1)
         Sort Key: revenue20.supplier_no
         Sort Method: quicksort  Memory: 25kB
         Buffers: shared hit=1054918 read=263570 written=1193
         ->  Subquery Scan on revenue20  (cost=1187198.74..1187282.42 rows=3719 width=12) (actual time=17770.694..17791.042 rows=1 loops=1)
               Buffers: shared hit=1054918 read=263570 written=1193
               ->  HashAggregate  (cost=1187198.74..1187245.23 rows=3719 width=12) (actual time=17770.693..17791.040 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=1054918 read=263570 written=1193
                     ->  Bitmap Heap Scan on lineitem  (cost=47408.81..1148066.62 rows=2236121 width=12) (actual time=1519.361..6123.286 rows=2241622 loops=1)
                           Recheck Cond: ((l_shipdate >= '1994-10-01'::date) AND (l_shipdate < '1994-12-30 00:00:00'::timestamp without time zone))
                           Heap Blocks: exact=653115
                           Buffers: shared hit=587463 read=71781 written=1151
                           ->  Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx  (cost=0.00..46849.78 rows=2236121 width=0) (actual time=1134.784..1134.784 rows=2245180 loops=1)
                                 Index Cond: ((l_shipdate >= '1994-10-01'::date) AND (l_shipdate < '1994-12-30 00:00:00'::timestamp without time zone))
                                 Buffers: shared hit=288 read=5841 written=177
 Planning time: 2.613 ms
 Execution time: 17805.682 ms
(38 rows)

drop view revenue20;
DROP VIEW
COMMIT;
COMMIT