DROP DOMAIN
Name
DROP DOMAIN -- remove a domain
Synopsis
DROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
Description
   DROP DOMAIN removes a domain.  Only the owner of
   a domain can remove it.
  
Parameters
- IF EXISTS
-       Do not throw an error if the domain does not exist. A notice is issued
      in this case.
      
- name
-       The name (optionally schema-qualified) of an existing domain.
      
- CASCADE
-       Automatically drop objects that depend on the domain (such as
      table columns).
      
- RESTRICT
-       Refuse to drop the domain if any objects depend on it.  This is
      the default.
      
Examples
   To remove the domain box:
DROP DOMAIN box;
Compatibility
   This command conforms to the SQL standard, except for the
   IF EXISTS option, which is a PostgreSQL
   extension.