DROP_DOMAIN - remove a domain
DROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]DROP DOMAIN removes a domain. Only the owner of a domain can remove it.
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), and in turn all objects that depend on those objects (see Section 5.14).
RESTRICT
Refuse to drop the domain if any objects depend on it. This is the default.
To remove the domain box:
DROP DOMAIN box;
This command conforms to the SQL standard, except for the IF EXISTS option, which is a PostgreSQL extension.
CREATE DOMAIN (CREATE_DOMAIN(7)), ALTER DOMAIN (ALTER_DOMAIN(7))