DROP DOMAIN

PostgreSQL 9.6.1 Documentation
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Name

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 5.13 ).
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.

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