Re: order by is ambiguous

On Thu, 2004-01-08 at 16:09, Tom Lane wrote:
> Travel Jadoo <jadoo(at)xs4all(dot)nl> writes:
> > I could not find any discussion on this but imho this seems an erroneous
> > error occuring now in 7.3.4 (after upgrade from 7.2.3):
>
> > select null::time, 'test'::varchar as time order by time;
> > ERROR: ORDER BY 'time' is ambiguous
>
> What's erroneous about it? You have two output columns named 'time'.
>
> regards, tom lane

Hmm but the first one has actually no name, it's just casted as datatype
time. I now realise that casted columns get assigned the datatype as
name. Should it not show ?column? as output just like you a "select
null;" would do?

This actually came up as I have multiple time fields but only one was
named time by me.

Regards,
Alfred