Hello, I am quite new to the community and PostgreSQL. My search in the acrhieves did not show any hints. I just installed PostgreSQL 9.6.1 64bit on Windows 10 64bit OS. Used EnterpriseDB setup. I wanted to create a database using LC_COLLATE "tr_TR.UTF-8". My pgsql command and error I receive is as follows: postgres=# CREATE DATABASE collationtest ENCODING 'UTF-8' LC_COLLATE 'tr_TR.UTF-8' TEMPLATE template0; ERROR: invalid locale name: "tr_TR.UTF-8" postgres=# Just for a test, I tried 'tr_TR.UTF8', 'tr_TR' and got same result for all. I am open to any advises and appreciate any help. Thanks & regards, Ertan Küçükoğlu -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin