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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: David G. Johnston <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Pavlo Golub <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: COPY manual is ambiguous about column list
Date: Fri, 20 Dec 2019 08:45:41 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKFQuwYHOpSfBcyX33Avt3ncrDsu6pxb-LXTm0SA+-nGWVSbhQ@mail.gmail.com>
References: <[email protected]>
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<[email protected]>
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On Thu, Dec 19, 2019 at 10:33:48PM -0700, David G. Johnston wrote:
> On Thursday, December 19, 2019, Tom Lane <[email protected]> wrote:
>
> "David G. Johnston" <[email protected]> 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
OK, how is this?
--
Bruce Momjian <[email protected]> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
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Attachments:
[text/x-diff] copy.diff (1.0K, 2-copy.diff)
download | inline diff:
diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml
new file mode 100644
index d9b7c4d..cf19706
*** a/doc/src/sgml/ref/copy.sgml
--- b/doc/src/sgml/ref/copy.sgml
*************** COPY { <replaceable class="parameter">ta
*** 61,71 ****
</para>
<para>
! If a list of columns is specified, <command>COPY</command> will
! only copy the data in the specified columns to or from the file.
! If there are any columns in the table that are not in the column list,
! <command>COPY FROM</command> will insert the default values for
! those columns.
</para>
<para>
--- 61,72 ----
</para>
<para>
! If a column list is specified, <command>COPY TO</command> copies only
! the data in the specified columns to the file. If a column list is
! specified in <command>COPY FROM</command>, the number and position of
! the columns must match those fields in the file. Table columns not
! specified in the <command>COPY FROM</command> column list will insert
! their default values.
</para>
<para>
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