单项选择题
A．触发器 B．嵌入式SQL C．存储过程 D．扩展存储过程
A．GUEST B．DBA C．PUBLIC D．ROLE
A．REVOKE SELECT ON TABLE Emp FROM U5 CASCADE; B．REVOKE SELECT ON TABLE Emp FROM U5 RESTRICT; C．REVOKE QUERY ON TABLE Emp FROM U5 CASCADE; D．GRANT SELECT ON TABLE Emp TO U5 WITH GRANT OPTION;