PostgreSQL:

ALTER COLLATION

Topic

ALTER COLLATION changes the definition of a collation.
You must own the collation to use ALTER COLLATION. To alter the owner, you must also be a direct or
indirect member of the new owning role, and that role must have CREATE privilege on the collation’s
schema. (These restrictions enforce that altering the owner doesn’t do anything you couldn’t do by
dropping and recreating the collation. However, a superuser can alter ownership of any collation
anyway.)

Example

ALTER COLLATION name RENAME TO new_name
ALTER COLLATION name OWNER TO { new_owner | CURRENT_USER |
SESSION_USER }
ALTER COLLATION name SET SCHEMA new_schema