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From: Igor Korot <[email protected]>
To: Adrian Klaver <[email protected]>
Cc: David G. Johnston <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: List of encodings
Date: Sun, 19 Apr 2026 20:13:29 -0500
Message-ID: <CA+FnnTxJyrnxR0hhV8T8J7Gb=MZ=OrtrEUcyoMf14-WHKgSb-A@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
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	<[email protected]>

Adrian,

On Sun, Apr 19, 2026 at 7:53 PM Adrian Klaver <[email protected]> wrote:
>
> On 4/19/26 5:19 PM, Igor Korot wrote:
> > Hi, Adrian,
> >
> > On Sun, Apr 19, 2026 at 4:21 PM Adrian Klaver <[email protected]> wrote:
>
> >>> What I noticed is that all encodings are default, as they all have 't'
> >>> in the last column.
> >>>
> >>> It's a little confusing...
> >>
> >> Not if you read the docs:
> >>
> >> https://www.postgresql.org/docs/current/catalog-pg-conversion.html
> >>
> >> "The catalog pg_conversion describes encoding conversion functions. See
> >> CREATE CONVERSION for more information."
> >>
> >> https://www.postgresql.org/docs/current/sql-createconversion.html
> >>
> >> "Conversions that are marked DEFAULT can be used for automatic encoding
> >> conversion between client and server. To support that usage, two
> >> conversions, from encoding A to B and from encoding B to A, must be
> >> defined."
> >
> >  From the https://www.postgresql.org/docs/current/catalog-pg-conversion.html:
> >
> > [quote]
> >
> > condefault bool
> >
> > True if this is the default conversion
> > [/quote]
> >
> > So, what info do I trust?
>
> Both.
>
> In your setup all the installed encoding conversion functions are also
> the default for those conversions. It is possible to create/install a
> conversion function that is not the default.

So, let's say I chose "BIG5"".

As stated the table contains:

 big5_to_utf8                   | BIG5           | t
 big5_to_euc_tw                 | BIG5           | t
 big5_to_mic                    | BIG5           | t

Since all 3 are default character sets, which one would be chosen?
(in the context of CREATE DATABASE)

Thank you.

>
> >
> > Thank you.
> >
>
>
>
> --
> Adrian Klaver
> [email protected]

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