Name
ALTER VIEW -- change the definition of a viewSynopsis
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_USER | SESSION_USER } 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
changes various auxiliary properties of a view. (If you want to modify the view's defining query, use CREATE OR REPLACE VIEW
.)
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 also be a direct or indirect member of 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.
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
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 be
local
orcascaded
. -
security_barrier
(boolean
) -
Changes the security-barrier property of the view. The value must be Boolean value, such as
true
orfalse
.
-
Notes
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
To rename the view foo
to bar
:
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 NULL INSERT INTO a_view(id) VALUES(2); -- ts will receive the current time
Compatibility
ALTER VIEW
is a PostgreSQL extension of the SQL standard.
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