DROP SCHEMA
Description
DROP SCHEMA removes schemas from the database.
A schema can only be dropped by its owner or a superuser. Note that the owner can drop the schema (and thereby all contained objects) even if he does not own some of the objects within the schema.
Parameters
- IF EXISTS
- Do not throw an error if the schema does not exist. A notice is issued in this case. 
- name
- The name of a schema. 
- CASCADE
- Automatically drop objects (tables, functions, etc.) that are contained in the schema. 
- RESTRICT
- Refuse to drop the schema if it contains any objects. This is the default. 
Examples
To remove schema mystuff from the database, along with everything it contains:
DROP SCHEMA mystuff CASCADE;