Re: how to evaluate a function only once for a query?

Nicolae Mihalache <mache@abcpages.com> writes:
> I've created a function timevalue(text) that returns a timestamp as
> result. The function works just fine.
> However, when I do a query like:
> "select * from mytable where time<timevalue('something')" I see that my
> function is evaluated once for each row in mytable.

See the "isCachable" attribute in CREATE FUNCTION.

            regards, tom lane