语句如下：

grant_stmt:
    GRANT privilege_type_list ON privilege_level TO user_option_list [WITH GRANT OPTION];
revoke_stmt:
    REVOKE privilege_type_list ON privilege_level FROM user_name_list;
show_grants_stmt:
    SHOW GRANTS [FOR user_name];
privilege_type_list:
    {ALL [PRIVILEGES] | privilege_type [, privilege_type ...]}
privilege_type:
      ALTER
    | CREATE
    | CREATE USER
    | CREATE VIEW
    | DELETE
    | DROP
    | GRANT OPTION
    | INDEX
    | INSERT
    | PROCESS
    | SELECT
    | SHOW DATABASES
    | SHOW VIEW
    | SUPER
    | UPDATE
    | USAGE
privilege_level:
      *
    | *.*
    | database_name.*
    | database_name.table_name
    | table_name
user_option_list:
    user_option [, user_option ...]
user_option:
    user_name [IDENTIFIED BY 'password']
password:
    STR_VALUE
user_name_list:
    user_name [, user_name ...]