Re: Escaping special characters - _ when doing COPY CSV - Mailing list pgsql-admin

From Edwin UY
Subject Re: Escaping special characters - _ when doing COPY CSV
Date
Msg-id CA+wokJ9vnqAg=baD2FzFptim4Ne-t0Tx3m7Mt8U4J-YzcjycgA@mail.gmail.com
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In response to Re: Escaping special characters - _ when doing COPY CSV  (Laurenz Albe <laurenz.albe@cybertec.at>)
Responses Re: Escaping special characters - _ when doing COPY CSV
List pgsql-admin
Thanks Laurenz, any trick up your sleeves that will work for a select * instead of having to do it for individual columns 

On Thu, Sep 4, 2025 at 7:29 PM Laurenz Albe <laurenz.albe@cybertec.at> wrote:
On Thu, 2025-09-04 at 18:01 +1200, Edwin UY wrote:
> I don't have access to run copy as this is a RDS database so I can only use \copy.
> I need to send the output to csv.
> One of the fields has a special character = \r. I can see it visually.
>
> Running the \copy below gives me extra row/s because of the \r
> \copy ( select *  from blah  where blah_ref = '666'   order by date_created desc  limit 5; ) to 'abc.csv' WITH CSV DELIMITER ',' HEADER
>
> I have tried this
> \copy ( select *  from blah  where blah_ref = '666'   order by date_created desc  limit 5; ) to 'abc.csv' WITH (FORMAT CSV, HEADER, ESCAPE '\r');
>
> But it gives ERROR:  COPY escape must be a single one-byte character.
>
> Besides using a view for the SQL, as suggested when I do a web search, any chance someone here knows how to do it without using a view?

There is no problem with having the carriage return characters in the CSV output,
but if you'd rather do without them, you could trim them:

  \copy (SELECT trim(textcol, E'\u000d'), othercol, ... FROM tab ...) TO ...

In order to include escape sequences into a string literal, you have to prepend
the opening single quote with an "E" for "extended":

  E'\r'
  E'\x0D'
  E'\u000D'
  E'\U0000000D'

Yours,
Laurenz Albe

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