DROP TYPE
Name
DROP TYPE -- remove a data type
Synopsis
DROP TYPE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
描述
DROP TYPE removes a user-defined data type.
Only the owner of a type can remove it.
参数
- IF EXISTS
Do not throw an error if the type does not exist. A notice is issued
in this case.
- name
The name (optionally schema-qualified) of the data type to remove.
- CASCADE
Automatically drop objects that depend on the type (such as
table columns, functions, operators).
- RESTRICT
Refuse to drop the type if any objects depend on it. This is
the default.
例子
To remove the data type box:
DROP TYPE box;
兼容性
This command is similar to the corresponding command in the SQL
standard, apart from the IF EXISTS
option, which is a PostgreSQL extension.
But note that much of the CREATE TYPE command
and the data type extension mechanisms in
PostgreSQL differ from the SQL standard.