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单选题
“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(grade)ON TABLE sc TOuser1
B
GRANT SELECT sc,UPDATE sc,grade TO user1
C
GRANT SELECT,UPDATE ON TABLE sc.grade TO user1
D
GRANT SELECT ON TABLE sc,UPDATE ON TABLE sc(grade)TO user1
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单选题“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(grade)ON TABLE sc TOuser1B
GRANT SELECT sc,UPDATE sc,grade TO user1C
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单选题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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