DROP TYPE
Name
DROP TYPE -- remove a data type
Synopsis
DROP TYPE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
Description
   DROP TYPE removes a user-defined data type.
   Only the owner of a type can remove it.
  
Parameters
- IF EXISTS
-       Do not throw an error if the type does not exist. A notice is issued
      in this case.
      
- name
-       The name (optionally schema-qualified) of the data type to remove.
      
- CASCADE
-       Automatically drop objects that depend on the type (such as
      table columns, functions, operators).
      
- RESTRICT
-       Refuse to drop the type if any objects depend on it.  This is
      the default.
      
Examples
   To remove the data type box:
DROP TYPE box;
Compatibility
   This command is similar to the corresponding command in the SQL
   standard, apart from the IF EXISTS
   option, which is a PostgreSQL extension.
   But note that much of the CREATE TYPE command
   and the data type extension mechanisms in
   PostgreSQL differ from the SQL standard.