Changes properties of a view.
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> [, ... ] )
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 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 does not do anything you could not do by dropping and recreating the view. However, a superuser can alter ownership of any view.
IF EXISTS
SET
/
DROP DEFAULT
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.
SET ( view\_option\_name [= view\_option\_value] [, ... ] )
RESET ( view\_option\_name [, ... ] )
Sets or resets a view option. Currently supported options are:
check_option
(string)
local
or
cascaded
.
security_barrier
(boolean)
true
or
false
.
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.
Rename the view myview
to newview
:
ALTER VIEW myview RENAME TO newview;
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
ALTER VIEW
is a Greenplum Database extension of the SQL standard.
CREATE VIEW, DROP VIEW in the Greenplum Database Utility Guide
Parent topic: SQL Commands