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From: Igor Korot <[email protected]>
To: David G. Johnston <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: List of encodings
Date: Sun, 19 Apr 2026 15:27:46 -0500
Message-ID: <CA+FnnTymNs9_3pBci01_Uu5OTNJFngOhu8_khpmUs88V8kX86Q@mail.gmail.com> (raw)
In-Reply-To: <CAKFQuwZOH6BPtaWJKr9jRGxdJt05YtLAZn1s_fYt=uzAASm9CQ@mail.gmail.com>
References: <CA+FnnTxFMiA+KMfypfGyY43G2kSx6-t5A351snUMmWC-2Lxvaw@mail.gmail.com>
	<CAKFQuwZOH6BPtaWJKr9jRGxdJt05YtLAZn1s_fYt=uzAASm9CQ@mail.gmail.com>

Hi, David,

On Sat, Apr 18, 2026 at 2:19 AM David G. Johnston
<[email protected]> wrote:
>
> On Friday, April 17, 2026, Igor Korot <[email protected]> wrote:
>>
>> Hi, ALL,
>> Does the list shown in
>> https://www.postgresql.org/docs/current/multibyte.html#MULTIBYTE-CHARSET-SUPPORTED
>> stored somewhere in INFORMATION_SCHEMA?
>
>
> This wouldn’t be under the purview of information schema.  You can find pg-specific pieces though:
>
> https://www.postgresql.org/docs/current/catalog-pg-conversion.html
>
> Note the function used to convert ids to names.

Tried the following query:

SELECT conname AS name, pg_encoding_to_char( conforencoding ) AS
encoding, condefault AS default FROM pg_conversion ORDER BY encoding;

and got following results (for simplicity I will post only couple of rows):

 big5_to_utf8                   | BIG5           | t
 big5_to_euc_tw                 | BIG5           | t
 big5_to_mic                    | BIG5           | t
 euc_cn_to_mic                  | EUC_CN         | t
 euc_cn_to_utf8                 | EUC_CN         | t
 euc_jis_2004_to_shift_jis_2004 | EUC_JIS_2004   | t
 euc_jis_2004_to_utf8           | EUC_JIS_2004   | t
 euc_jp_to_mic                  | EUC_JP         | t
 euc_jp_to_sjis                 | EUC_JP         | t
 euc_jp_to_utf8                 | EUC_JP         | t
 euc_kr_to_utf8                 | EUC_KR         | t
 euc_kr_to_mic                  | EUC_KR         | t
 euc_tw_to_big5                 | EUC_TW         | t
 euc_tw_to_utf8                 | EUC_TW         | t
 euc_tw_to_mic                  | EUC_TW         | t

What I noticed is that all encodings are default, as they all have 't'
in the last column.

It's a little confusing...

Thx for the help.

>
>>
>>
>> Or is it hard coded inside the PostgreSQL codebase?
>
>
>  Yes.  Doesn’t preclude exposing it via SQL but we don’t do so directly.
>
> David J.

reply

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