“把查询sc表和更新sc表的grade列的权限受予用户userl”的正确SQL语句是( )。A)GRANT SELECT,UP DATE(grade)ON TABLE sc TO userlB)GRANT SELECT sc,UP DATE sc,grade TO userlC)GRANT SELECT,UP DATE ON TABLE sc,grade TO userlD)GRANT SELECT ON ABLE sc,UP DATE ON TABLE sc(grade) TO userl

“把查询sc表和更新sc表的grade列的权限受予用户userl”的正确SQL语句是( )。

A)GRANT SELECT,UP DATE(grade)ON TABLE sc TO userl

B)GRANT SELECT sc,UP DATE sc,grade TO userl

C)GRANT SELECT,UP DATE ON TABLE sc,grade TO userl

D)GRANT SELECT ON ABLE sc,UP DATE ON TABLE sc(grade) TO userl


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学生一选课一课程数据库中的三个基本表: 学生信息表:STUDENT(sno,sname,sex,age,dept)主码为sno 课程信息表:CDLIRSB(cno,cname,teacher)主码为cno 学生选课信息表:SC(sno,cno,grade)主码为(sno,cno) “查询没有学习成绩的学生的学号和课程号”的SQL语句是()A、SELECT snc,cno FROM SC WHERE grade=NULLB、SELECT sno,cno FROM SC WHERE gradeIS’’C、SELECT sno.cno FROM SC WHERE gradeISNULLD、SELECT sno.cno FROM SC WHERE grade=’ ’

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