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ALTER VIEW(7)		PostgreSQL 9.6.19 Documentation		 ALTER VIEW(7)

NAME
       ALTER_VIEW - change the definition 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 | 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 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.

       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
	       or cascaded.

	   security_barrier (boolean)
	       Changes the security-barrier property of	the view. The value
	       must be Boolean value, such as true or false.

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.

SEE ALSO
       CREATE VIEW (CREATE_VIEW(7)), DROP VIEW (DROP_VIEW(7))

PostgreSQL 9.6.19		     2020			 ALTER VIEW(7)

NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | NOTES | EXAMPLES | COMPATIBILITY | SEE ALSO

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