Postgresql 中文操作指南

DROP DOMAIN

DROP DOMAIN — 删除域

DROP DOMAIN — remove a domain

DROP DOMAIN [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]

DROP DOMAIN 删除一个域。只有该域的所有者才能删除它。

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.

如需删除域 box ：

To remove the domain box:

DROP DOMAIN box;

此指令符合 SQL 标准，但 IF EXISTS 选项除外，该选项是 PostgreSQL 扩展。

This command conforms to the SQL standard, except for the IF EXISTS option, which is a PostgreSQL extension.