I have fresh installation of PostgreSQL 9.1.x. Unfortunately, I discovered that OS doesn't support LC_COLLATE = 'pl_PL.utf8' and LC_CTYPE = 'pl_PL.utf8'. I read in PostgreSQL documentation that:

On all platforms, the collations named default, C, and POSIX are available. Additional collations may be available depending on operating system support.

Is a way, however to force Windows to support that locale ? I mean a patch, plugin or something.

2 Answers 2


On Windows, it's likely that the needed locale is already installed, it's just named differently than on Unix.

As an example, the following database creation appears to works fine for me with PG9.1 on my Windows XP, with its default locale French_France.1252 and no additional language pack installed that I'd recall.

       ENCODING = 'UTF8'
       LC_COLLATE = 'Polish'
       LC_CTYPE = 'Polish'

Also, a quick test of the sort order by submitting this query in UTF8 in this newly created database:

select * from (values ('z'), ('ź'), ('ż'), ('s'), ('ś'), ('x'), ('y')) as letters order by 1;

seems to output correct results:


  • Hmmm... maybe You're right...
    – marioosh
    Aug 30, 2012 at 12:29

Not as far as I know, you can't force the Windows version of PostgreSQL to support locales and collations not offered by Windows. PostgreSQL uses the system locale and collation support. If the system doesn't support it, you can't use it. This is a frustrating limitation at times, but how it is. You need to pick a suitable encoding and collation supported by your Windows install.

If you want to alias an OS collation name and call it pl_PL.utf8 you may be able to do that with CREATE COLLATION.

See Character set support, Collation Support and the pg_collation catalog table.

What's the problem you're trying to solve with this?

  • By "No." You mean that is no way to support this on Windows? Maybe i can install something to make it work. I need that LC_COLLATE, LC_CTYPE are set to 'pl_PL.utf8' to valid sorting.
    – marioosh
    Aug 29, 2012 at 12:35
  • @marioosh You need to find out what the equivalent Windows locale with the collation rules you need. In my view this is a bit of a wart; I really wish Pg would supply at least optional internal collation/encoding support, rather than having to always rely on the OS's support. Answer updated with a docs link. Aug 29, 2012 at 13:14

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