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CREATE COLLATION(7)     PostgreSQL 9.5.0 Documentation     CREATE COLLATION(7)


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))

PostgreSQL 9.5.0                     2016                  CREATE COLLATION(7)

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