CREATE COLLATION
Defines a new collation.
Synopsis
CREATE COLLATION <name> (
LOCALE = <locale>
)
CREATE COLLATION <name> (
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 the CREATE privilege on the destination schema.
Parameters
| Parameter | Description |
|---|---|
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 |
Use the specified operating system locale for the |
lc_ctype |
Use the specified operating system locale for the |
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 Collation Support in the PostgreSQL documentation for more information about collation support in Greengage DB.
Examples
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, run:
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 Greengage DB extension.