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https://www.postgresql.org/docs/9.1/collation.html
Collation Support The collation feature allows specifying the sort order and character classification behavior of data per-column, or even per-operation. This alleviates the restriction that the LC_COLLATE and LC_CTYPE settings of a database cannot be changed after its creation.
https://www.postgresql.org/docs/10/collation.html
Additional collations may be available depending on operating system support. The default collation selects the LC_COLLATE and LC_CTYPE values specified at database creation time. The C and POSIX collations both specify “ traditional C ” behavior, in which only the ASCII letters “ A ” through “ Z ” are treated as letters, and sorting is done strictly by character code byte values.
https://postgrespro.com/docs/postgresql/9.6/collation
Additional collations may be available depending on operating system support. The default collation selects the LC_COLLATE and LC_CTYPE values specified at database creation time. The C and POSIX collations both specify “ traditional C ” behavior, in which only the ASCII letters “ A ” through “ Z ” are treated as letters, and sorting is done strictly by character code byte values.
https://www.2ndquadrant.com/en/blog/icu-support-postgresql-10/
May 22, 2017 · Proper collation support, independent of O.S is really a nice addition to postgresql. This will make easier to port from databases that have different collations. I have one Sybase ASE and one SqlServer with collation LATIN1_CI_AI (case insensitive, accent insensitive).
https://stackoverflow.com/questions/11005036/does-postgresql-support-accent-insensitive-collations
PostgreSQL does not support collations like that (accent insensitive or not) because no comparison can return equal unless things are binary-equal. This is because internally it would introduce a lot of complexities for things like a hash index.
https://www.enterprisedb.com/docs/en/9.5/pg/collation.html
Collation Support The collation feature allows specifying the sort order and character classification behavior of data per-column, or even per-operation. This alleviates the restriction that the LC_COLLATE and LC_CTYPE settings of a database cannot be changed after its creation.
https://dba.stackexchange.com/questions/195502/postgres-collate-example-in-select
PostgreSQL does not support = or LIKE on COLLATE. This is because internally index ordering uses = and so even if the collation returns that they're equal PostgreSQL falls back to binary equal.
https://www.postgresql.org/docs/9.1/multibyte.html
The character set support in PostgreSQL allows you to store text in a variety of character sets (also called encodings), including single-byte character sets such as the ISO 8859 series and multiple-byte character sets such as EUC (Extended Unix Code), UTF-8, and Mule internal code. All supported character sets can be used transparently by clients, but a few are not supported for use within the …
https://wiki.postgresql.org/wiki/Collations
Nov 11, 2019 · This means that collations must be carefully versioned." What are we doing about it? Peter Eisentraut worked on adding ICU support to PostgreSQL 10. ICU is an alternative provider of collations (and many other things) that is much more powerful than libc, and, crucially, it can report a version string that you can use to detect when its underlying ordering rules change.
https://www.vertabelo.com/blog/collations-in-postgresql/
Jan 05, 2015 · Collations in PostgreSQL are available depending on operating system support. For example, in Ubuntu type locale -a to list the names of the available collations. The same locales are available in PostgreSQL in the pg_collation catalog (mappings from an SQL name to operating system locale categories).
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