Thanks, I learnt to use:
SELECT CAST('1/11/2003' AS DATE) AS invoice_number;
and it does what I would expect ;-).
"Stephan Szabo" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
>
> On Fri, 21 Nov 2003, Gaetano Mendola wrote:
>
> > nobody wrote:
> > > I have found it in documentation, it is single quote. But it does not
> > > explain why
> > >
> > > SELECT '1/11/2003' AS "InvoiceDate";
> > >
> > > returns "unknown" data type instead of "date".
>
> (I haven't seen the original message yet, so I'm replying to a reply)
> Date literals are generally written as:
> DATE '1/11/2003'
>
> PostgreSQL will try to guess what type you meant with quoted strings in
> expressions, but in the above there isn't enough context to do guess that
> you meant a date really (it should probably actually be thought of as a
> string in such cases).
>
>
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