ALTER VIEW
Synopsis
ALTER VIEW [ IF EXISTS ]name ALTER [ COLUMN ]column_name SET DEFAULTexpressionALTER VIEW [ IF EXISTS ]name ALTER [ COLUMN ]column_name DROP DEFAULTALTER VIEW [ IF EXISTS ]name OWNER TOnew_ownerALTER VIEW [ IF EXISTS ]name RENAME TOnew_nameALTER VIEW [ IF EXISTS ]name SET SCHEMAnew_schemaALTER VIEW [ IF EXISTS ]name SET (view_option_name [=view_option_value] [, ... ] )ALTER VIEW [ IF EXISTS ]name RESET (view_option_name [, ... ] )
Description
ALTER VIEW changes various auxiliary properties of a view. (If you want to modify the view's defining query, useCREATE OR REPLACE VIEW.)
You must own the view to useALTER VIEW. To change a view's schema, you must also haveCREATE privilege on the new schema. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must haveCREATE 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.
- 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 anyINSERT orUPDATE 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 (string)
Changes the check option of the view. The value must belocal orcascaded.
- security_barrier (boolean)
Changes the security-barrier property of the view. The value must be Boolean value, such astrue orfalse.
Notes
For historical reasons,ALTER TABLE can be used with views too; but the only variants ofALTER TABLE that are allowed with views are equivalent to the ones shown above.
Examples
To rename the viewfoo tobar:
ALTER VIEW foo RENAME TO bar;
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 NULLINSERT INTO a_view(id) VALUES(2); -- ts will receive the current time