NAME

       CREATE_COLLATION - define a new collation

SYNOPSIS

       CREATE COLLATION name (
           [ LOCALE = locale, ]
           [ LC_COLLATE = lc_collate, ]
           [ LC_CTYPE = lc_ctype ]
       )
       CREATE COLLATION name FROM existing_collation

DESCRIPTION

       CREATE COLLATION defines a new collation using the specified operating system locale
       settings, or by copying an existing collation.

       To be able to create a collation, you must have CREATE privilege on the destination
       schema.

PARAMETERS

       name
           The name of the collation. The collation name can be schema-qualified. If it is not,
           the collation is defined in the current schema. The collation name must be unique
           within that schema. (The system catalogs can contain collations with the same name for
           other encodings, but these are ignored if the database encoding does not match.)

       locale
           This is a shortcut for setting LC_COLLATE and LC_CTYPE at once. If you specify this,
           you cannot specify either of those parameters.

       lc_collate
           Use the specified operating system locale for the LC_COLLATE locale category. The
           locale must be applicable to the current database encoding. (See CREATE DATABASE
           (CREATE_DATABASE(7)) for the precise rules.)

       lc_ctype
           Use the specified operating system locale for the LC_CTYPE locale category. The locale
           must be applicable to the current database encoding. (See CREATE DATABASE
           (CREATE_DATABASE(7)) for the precise rules.)

       existing_collation
           The name of an existing collation to copy. The new collation will have the same
           properties as the existing one, but it will be an independent object.

NOTES

       Use DROP COLLATION to remove user-defined collations.

       See Section 22.2, “Collation Support”, in the documentation for more information about
       collation support in PostgreSQL.

EXAMPLES

       To create a collation from the operating system locale fr_FR.utf8 (assuming the current
       database encoding is UTF8):

           CREATE COLLATION french (LOCALE = 'fr_FR.utf8');

       To create a collation from an existing collation:

           CREATE COLLATION german FROM "de_DE";

       This can be convenient to be able to use operating-system-independent collation names in
       applications.

COMPATIBILITY

       There is a CREATE COLLATION statement in the SQL standard, but it is limited to copying an
       existing collation. The syntax to create a new collation is a PostgreSQL extension.

SEE ALSO

       ALTER COLLATION (ALTER_COLLATION(7)), DROP COLLATION (DROP_COLLATION(7))