Postgresql 中文操作指南
Synopsis
ALTER VIEW [ IF EXISTS ] name ALTER [ COLUMN ] column_name SET DEFAULT expression
ALTER VIEW [ IF EXISTS ] name ALTER [ COLUMN ] column_name DROP DEFAULT
ALTER VIEW [ IF EXISTS ] name OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER VIEW [ IF EXISTS ] name RENAME [ COLUMN ] column_name TO new_column_name
ALTER VIEW [ IF EXISTS ] name RENAME TO new_name
ALTER VIEW [ IF EXISTS ] name SET SCHEMA new_schema
ALTER VIEW [ IF EXISTS ] name SET ( view_option_name [= view_option_value] [, ... ] )
ALTER VIEW [ IF EXISTS ] name RESET ( view_option_name [, ... ] )Description
ALTER VIEW 更改视图的各种辅助属性。（如果您要更改视图的定义查询，请使用 CREATE OR REPLACE VIEW 。）
ALTER VIEW changes various auxiliary properties of a view. (If you want to modify the view’s defining query, use CREATE OR REPLACE VIEW.)
您必须拥有该视图才能使用 ALTER VIEW 。要更改视图的架构，您还必须具有新架构上的 CREATE 权限。要更改所有者，您必须能够为新所有角色 SET ROLE ，并且该角色必须在其架构上拥有 CREATE 权限。（这些限制强制更改所有者不会执行您无法通过删除和重新创建视图而做的事情。但是，超级用户始终可以更改任何视图的所有权。）
You must own the view to use ALTER VIEW. To change a view’s schema, you must also have CREATE privilege on the new schema. To alter the owner, you must be able to SET ROLE to the new owning role, and that role must have CREATE privilege on the view’s schema. (These restrictions enforce that altering the owner doesn’t do anything you couldn’t do by dropping and recreating the view. However, a superuser can alter ownership of any view anyway.)
Parameters
-
name
-
The name (optionally schema-qualified) of an existing view.
-
-
column_name
-
Name of an existing column.
-
-
new_column_name
-
New name for an existing column.
-
-
IF EXISTS
-
Do not throw an error if the view does not exist. A notice is issued in this case.
-
-
SET/DROP DEFAULT
-
These forms set or remove the default value for a column. A view column’s default value is substituted into any INSERT or UPDATE command whose target is the view, before applying any rules or triggers for the view. The view’s default will therefore take precedence over any default values from underlying relations.
-
-
new_owner
-
The user name of the new owner of the view.
-
-
new_name
-
The new name for the view.
-
-
new_schema
-
The new schema for the view.
-
-
SET ( _view_option_name [= view_option_value] [, … ] )RESET ( _view_option_name_ [, … ] )_
-
Sets or resets a view option. Currently supported options are:
-
-
check_option (enum)
-
Changes the check option of the view. The value must be local or cascaded.
-
-
security_barrier (boolean)
-
Changes the security-barrier property of the view. The value must be a Boolean value, such as true or false.
-
-
security_invoker (boolean)
-
Changes the security-invoker property of the view. The value must be a Boolean value, such as true or false.
-
Notes
出于历史原因， ALTER TABLE 也可用于视图；但是，只允许在视图中使用等同于上面显示的 ALTER TABLE 的变体。
For historical reasons, ALTER TABLE can be used with views too; but the only variants of ALTER TABLE that are allowed with views are equivalent to the ones shown above.
Examples
要将视图 foo 重命名为 bar ：
To rename the view foo to bar:
ALTER VIEW foo RENAME TO bar;要将默认列值附加到可更新视图：
To attach a default column value to an updatable view:
CREATE TABLE base_table (id int, ts timestamptz);
CREATE VIEW a_view AS SELECT * FROM base_table;
ALTER VIEW a_view ALTER COLUMN ts SET DEFAULT now();
INSERT INTO base_table(id) VALUES(1); -- ts will receive a NULL
INSERT INTO a_view(id) VALUES(2); -- ts will receive the current timeCompatibility
ALTER VIEW 是 SQL 标准的 Postgresql 扩展。
ALTER VIEW is a PostgreSQL extension of the SQL standard.