Stephan Szabo wrote:
> On 8 Jul 2003, Markus Bertheau wrote:
>
> > when you have
> > select expensive_expression(column), * from table offset 20 limit 40
> >
> > can you somehow save the cost for the first 20 calculations of
> > expensive_expression?
>
> Right now the only way I can think of that might work is to push the
> offset/limit into a subselect on table and then do the
> expensive_expression at the top level.
Well, you can do:
SELECT * FROM (SELECT * FROM pg_class) AS pg_class
so you could do:
SELECT func(relname), *
FROM (SELECT * FROM pg_class OFFSET 20 LIMIT 40) AS pg_class
--
Bruce Momjian | http://candle.pha.pa.us
[EMAIL PROTECTED] | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
---------------------------(end of broadcast)---------------------------
TIP 4: Don't 'kill -9' the postmaster
