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

该语句改变视图的定义，而视图必须存在。语法类似于 CREATE VIEW see 第 15.1.23 节，“CREATE VIEW 语句”）。该语句要求视图的权限为 CREATE VIEW“和 DROP 权限，以及对 SELECT 语句。ALTER VIEW 仅允许定义者或拥有 SET_ANY_DEFINER 或 ALLOW_NONEXISTENT_DEFINER权限。This statement changes the definition of a view, which must exist. The syntax is similar to that for CREATE VIEW see Section 15.1.23, “CREATE VIEW Statement”). This statement requires the CREATE VIEW and DROP privileges for the view, and some privilege for each column referred to in the SELECT statement. ALTER VIEW is permitted only to the definer or users with the SET_ANY_DEFINER or ALLOW_NONEXISTENT_DEFINER privilege.