Change the name of a database role.
Syntax
      ALTER ROLE role WITH NAME = new_name
Key
   role       The role to alter.
   new_name   The new name for the role.
Starting in SQL Server 2005 the behavior of schemas changed in that schemas are no longer equivalent to database users.
Example
ALTER ROLE doctors WITH NAME = specialists; GO
"I don't know if I believe in role models. We're all so different; we're all individuals. In the long run, that's what matters" ~ Wilson Cruz
Related commands:
  CREATE ROLE
  DROP ROLE  
  sys.database_role_members  
  sp_addrolemember  - Add members to a role
Equivalent Oracle command:  ALTER ROLE