ALTER VIEW
ALTER VIEW
ALTER VIEW - change the definition of a view
Synopsis
ALTER VIEW [ IF EXISTS ]nameALTER [ COLUMN ]column_nameSET DEFAULTexpressionALTER VIEW [ IF EXISTS ]nameALTER [ COLUMN ]column_nameDROP DEFAULT ALTER VIEW [ IF EXISTS ]nameOWNER TO {new_owner| CURRENT_ROLE | CURRENT_USER | SESSION_USER } ALTER VIEW [ IF EXISTS ]nameRENAME [ COLUMN ]column_nameTOnew_column_nameALTER VIEW [ IF EXISTS ]nameRENAME TOnew_nameALTER VIEW [ IF EXISTS ]nameSET SCHEMAnew_schemaALTER VIEW [ IF EXISTS ]nameSET (view_option_name[=view_option_value] [, ... ] ) ALTER VIEW [ IF EXISTS ]nameRESET (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.
-
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
INSERTorUPDATEcommand 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
localorcascaded. -
security_barrier(boolean) -
Changes the security-barrier property of the view. The value must be Boolean value, such as
trueorfalse.
-
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.