【简答题】● 收回用户li对表employee的查询权限,同时级联收回li授予其他用户的该权限,SQL语句为: (52) select ON TABLE employee FROM li (53) (52) A. GRANT B. GIVE C. CALL BACK D. REVOKE (53) A. RESTRICT B. CASCADE C. WITH GRANT OPTION D. WITH CHEC...
【单选题】听力原文: Although twins have always been a source of curiosity, they are not so uncommon statistically, since they occur once in every 86 births. About one-third of all twins are identical, or single-egg...