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help / color / mirror / Atom feedFrom: Ibrahim Shaame <ishaame@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: depesz@depesz.com
Cc: pgsql-novice@lists.postgresql.org <pgsql-novice@lists.postgresql.org>
Subject: Re: Adding column in a recursive query
Date: Mon, 30 Mar 2026 18:11:08 +0300
Message-ID: <CAJOWwD6GpzqUjz6dn+3ye2fRz83EK6eb_buZ18bv4f_iENTJOw@mail.gmail.com> (raw)
In-Reply-To: <2006840.1774881078@sss.pgh.pa.us>
References: <CAJOWwD5_saumY5Xv1QAQ=VxwMQrz-tF6G-Fwek-ew52-=_uOXg@mail.gmail.com>
<acppj9U8zquc2O7z@depesz.com>
<CAJOWwD5XcMzwMrkaL-vD8d553y0BzQBppObZhau6zYxA4hj5nw@mail.gmail.com>
<2006840.1774881078@sss.pgh.pa.us>
Effectively, after removing the column names from x(jina, namba, nasaba_1)
it works now. Thank you very much. But then I don't understand the
advantage or inconvenience of naming or not naming the columns there. Is
there any explanation somewhere?
Thanks again
Ibrahim
On Mon, Mar 30, 2026 at 5:31 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Ibrahim Shaame <ishaame@gmail.com> writes:
> > Thanks for the reply. Both are integers and they work well without the
> two
> > lines. So what changed one of them to text. Can you see where? I have not
> > been able to identify.
>
> This bit is forcing the column names for just the first three
> output columns, leaving the rest to default from the SELECT
> targetlist:
>
> WITH RECURSIVE x(jina, namba, nasaba_1) AS (
>
> That's a hazardous practice: usually I'd force all or none of
> the column names that way. In this case, I speculate that you
> carelessly added the new column as one of the physically first
> three SELECT outputs, and didn't adjust this list to match,
> leading to confusion about which column is "x.namba".
>
> If that's not it, you need to be a great deal more specific
> about exactly how you changed the query.
>
> regards, tom lane
>
reply
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Subject: Re: Adding column in a recursive query
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