ALTER VIEW
Changes properties of a view.
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>
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.
To run this command, you must be the owner of the view.
To change a view’s schema, you must also have the 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 the CREATE privilege on the view’s schema.
These restrictions enforce that altering the owner does not do anything you could not do by dropping and recreating the view.
However, a superuser can alter ownership of any view.
Parameters
| Parameter | Description |
|---|---|
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 |
new_owner |
The new owner for the view |
new_name |
The new name of the view |
new_schema |
The new schema for the view |
SET ( <view_option_name> [= <view_option_value>] [, … ] ) |
Sets or resets a view option. Currently supported options are:
|
Notes
For historical reasons, ALTER TABLE can be used with views, too; however, the only variants of ALTER TABLE that are allowed with views are equivalent to the statements shown above.
For example, you can rename the myview view to newview in either of the following two ways:
ALTER VIEW myview RENAME TO newview;
ALTER TABLE myview RENAME TO newview;Examples
Rename the view foo to bar:
ALTER VIEW foo RENAME TO bar;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 is a Greengage DB extension of the SQL standard.