Re: Casting varchar to interval.?

Is this a bug? You can work around it by wrapping the varying in a trim()
function (e.g. select trim(config_value)::interval from config). I've solved
another suspicious looking issue with that same kind of workaround.

Best regards,

Jim Wilson

"D. Dante Lorenso" <dante(at)lorenso(dot)com> said:

> I was hoping to cast a varchar to an interval.
> How is this done? Nobody has provided an answer to
> this questing when asked in the past:
>
> http://archives.postgresql.org/pgsql-general/2002-07/msg01482.php
>
> I have a table 'config' that contains:
>
> CREATE TABLE "public"."config" (
> "config_key" VARCHAR(64) NOT NULL,
> "config_value" VARCHAR(256) NOT NULL,
> PRIMARY KEY("config_key")
> ) WITH OIDS;
>
> So I can do this:
>
> # SELECT config_value
> # FROM config
> # WHERE config_key = 'commission_withhold_interval';
> config_value
> --------------
> 1 month
> (1 row)
>
> But I can't do this:
>
> # SELECT config_value::interval
> # FROM config
> # WHERE config_key = 'commission_withhold_interval';
>
> ERROR: cannot cast type character varying to interval
>
> Why doesn't that work?