A.
把查询 Student表权限授给用户U1 GRANT SELECT ON TABLE Student TO U1;
B.
把对表SC的查询权限授予所有用户 GRANT SELECT ON TABLE SC TO PUBLIC;
C.
把对Student表和Course表的全部权限授予用户U2和U3 GRANT ALL PRIVILIGES ON TABLE Student, Course TO U2,U3;
D.
把查询Student表和修改学生学号的权限授给用户U4 GRANT UPDATE, SELECT ON TABLE Student TO U4;