Re: List of encodings

Hi, David,

On Sat, Apr 18, 2026 at 2:19 AM David G. Johnston
<david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
>
> On Friday, April 17, 2026, Igor Korot <ikorot01(at)gmail(dot)com> 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.