DROP DOMAIN SQL - Language Statements DROP DOMAIN remove a domain DROP DOMAIN DROP DOMAIN name [, ...] [ CASCADE | RESTRICT ] DROP DOMAIN will remove a domain. Only the owner of a domain can remove it. 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. To remove the domain box: DROP DOMAIN box; This command conforms to the SQL standard.