ALTER
    [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}]
    [DEFINER = { user | CURRENT_USER }]
    [SQL SECURITY { DEFINER | INVOKER }]
    VIEW view_name [(column_list)]
    AS select_statement
    [WITH [CASCADED | LOCAL] CHECK OPTION]

This statement changes the definition of a view, which must exist. The syntax is similar to that for CREATE VIEW and the effect is the same as for CREATE OR REPLACE VIEW. See Section 22.2, “CREATE VIEW Syntax”. This statement requires the CREATE VIEW and DROP privileges for the view, and some privilege for each column referred to in the SELECT statement. As of MySQL 5.0.52, ALTER VIEW is allowed only to the original definer or users with the SUPER privilege.

This statement was added in MySQL 5.0.1. The DEFINER and SQL SECURITY clauses may be used as of MySQL 5.0.16 to specify the security context to be used when checking access privileges at view invocation time. For details, see Section 22.2, “CREATE VIEW Syntax”.