Removes a domain.
DROP DOMAIN [IF EXISTS] <name> [, ...] [CASCADE | RESTRICT]
DROP DOMAIN removes a previously defined domain. You must be the owner of a domain to drop it.
Do not throw an error if the domain does not exist. A notice is issued in this case.
The name (optionally schema-qualified) of an existing domain.
Automatically drop objects that depend on the domain (such as table columns).
Refuse to drop the domain if any objects depend on it. This is the default.
Drop the domain named
DROP DOMAIN zipcode;
This command conforms to the SQL standard, except for the
IF EXISTS option, which is a Greenplum Database extension.
ALTER DOMAIN, CREATE DOMAIN
Parent topic: SQL Command Reference