From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Pavlo Golub <pavlo(dot)golub(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, "pgsql-docs(at)lists(dot)postgresql(dot)org" <pgsql-docs(at)lists(dot)postgresql(dot)org> |
Subject: | Re: COPY manual is ambiguous about column list |
Date: | 2019-12-20 05:33:48 |
Message-ID: | CAKFQuwYHOpSfBcyX33Avt3ncrDsu6pxb-LXTm0SA+-nGWVSbhQ@mail.gmail.com |
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Lists: | pgsql-docs |
On Thursday, December 19, 2019, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> "David G. Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> writes:
> > Seems better to simply talk about each form independently:
>
> > If a list of columns is specified, <command>COPY TO</command> will only
> > copy the data in the specified columns to the file. <command>COPY
> > FROM</command> will, by position (i.e., the number of columns listed must
> > match the number of columns in the file), match each file column to the
> > named column in the table. Any additional columns present in the table
> > will receive their default value.
>
> +1 for separating it like that, but your middle sentence reads awkwardly
> to me. How about something like
>
> <command>COPY FROM</command> will match each listed column in the table
> to a file column by position (so the number of columns listed must match
> the number of columns in the file).
>
>
>
+1
David J.
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