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From: Tom Lane <[email protected]>
To: David G. Johnston <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: Pavlo Golub <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: [email protected]
Subject: Re: COPY manual is ambiguous about column list
Date: Fri, 20 Dec 2019 00:32:30 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKFQuwaxE-m5VKQkOapv+3kMnP2Q9hEb0NbGeBfqkQuX3UmVgQ@mail.gmail.com>
References: <[email protected]>
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"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).

			regards, tom lane

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