将查询SC表的权限授予用户U1，并允许该用户再将此权限授予其他用户。实现此功能的正确SQL语句是______。 A: GRANT SELECT TO TABLE SC ON U1 WITH PUBLIC B: GRANT SELECT ON TABLE SC TO U1 WITH PUBLIC C: GRANT SELECT TO TABLE SC ON U1 WITH GRANT OPTION D: GRANT SELECT ON TABLE SC TO U1 WITH GRANT OPTION

将Students表的查询权限授予用户U1和U2，并允许该用户将此权限授予其他用户。实现此功能的SQL语句是：（）。 A: GRANT SELECT TO TABLE Students ON U1,U2 WITH PUBLIC; B: GRANT SELECT ON TABLE Students TO U1,U2 WITH PUBLIC; C: GRANT SELECT TO TABLE Students ON U1,U2 WITH GRANT OPTION; D: GRANT SELECT ON TABLE Students TO U1,U2 WITH GRANT OPTION;

将查询Student表和修改学生学号的权限授给用户U4。实现此功能的SQL语句是(<br/>)。 A: GRANT UPDATE(Sno),SELECT<br/>ON TABLE Student TO U4 ; B: GRANT UPDATE,SELECT<br/>ON TABLE Student TO U4 ; C: GRANT SELECT ON TABLE<br/>Student TO U4 ; D: GRANT UPDATE ON TABLE<br/>Student TO U4 ;

“把查询SC表和更新SC表的grade列的权限授予用户user”的正确SQL语句是( )。 A: GRANT SELECT sc．UPDATE sc.grade TO user B: GRANT SELECT,UPDATE(grade)ON TABLE sc TO user C: GRANT SELECT,UPDATE ON TABLE sc．grade TO user D: GRANT SELECT ON TABLE sc，UPDATE ON TABLE sc(grade)TO user

8.修改基本表的命令是( )。 A: CREATE TABLE B: ALTER TABLE C: DROP TABLE D: GRANT TABLE

授予user1用户修改st表中的“姓名”字段的权限,应使用的SQL语句是(<br/>) A: GRANT<br/>UPDATE(姓名)<br/>ON st TABLE TO user1 B: GRANT<br/>UPDATE(姓名)<br/>ON TABLE st TO user1 C: GRANT<br/>MODIFY(姓名)<br/>ON st TABLE TO user1 D: GRANT<br/>MODIFY(姓名)<br/>ON TABLE st TO user1

“把查询sc表和更新sc表的grade列的权限受予用户user1”的正确SQL语句是（）。 A: GRANT SELECT, UPDATE(gradON TABLE sc TO user1 B: GRANT SELECT sc, UPDATE sc, grade TO user1 C: GRANT SELECT, UPDATE ON TABLE s grade TO user1 D: GRANT SELECT ON TABLE sc, UPDATE ON TABLE sc(grad TO user1

使角色R1 减少 SELECT 权限的语句是 A: REVOKE SELECT ON TABLE Student FROM R1 B: REVOKE SELECT ON TABLE Student TO R1 C: GRANT SELECT ON TABLE Student FROM R1 D: GRANT SELECT ON TABLE Student TO R1

在数据定义语言中，属于修改表结构的命令有（） A: CREATE TABLE B: DROP TABLE C: ALTER TABLE D: GRANT TABLE

使角色 R1 在原来的基础上增加 Student 表的 DELETE 权限的语句是 A: GRANT DELETE ON TABLE Student FROM R1 B: GRANT DELETE ON TABLE Student TO R1 C: REVOKE DELETE ON TABLE Student FROM R1 D: REVOKE DELETE ON TABLE Student TO R1