Hi all,
This query executes very slow:
select (select count(*) from customer where id <= a.id) as row, id, from customer as a order by id;
Where customer has id column and others and has also index on id column. The table has about 10.000+ records. When used
with"explain", it gives me this output:
QUERY PLAN
-----------------------------------------------------------------------------------------Sort
(cost=6513774.23..6513801.37rows=10855 width=14) Sort Key: id -> Seq Scan on customer a (cost=0.00..6513046.62
rows=10855width=14) SubPlan -> Aggregate (cost=599.94..599.95 rows=1 width=0) ->
BitmapHeap Scan on customer (cost=28.66..590.89 rows=361 width=0) Recheck Cond: (id <= $0)
-> Bitmap Index Scan on iid (cost=0.00..28.66 rows=361 width=0) Index Cond:
(id<= $0)
(9 riadkov)
So is there any solution to speed up this query? Or can I get the same result but with some other query?
thanks
Trigve
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