把对关系SC的属性GRADE的修改权授予用户ZHAO的SQL语句是 （）

A:GRANT GRADE ON SC TO ZHAO B:GRANT UPDATE ON SC TO ZHAO C:GRANT UPDATE (GRADE) ON SC TO ZHAO D:GRANT UPDATE ON SC (GRADE) TO ZHAO

Quality and grade are not the same. A fundamental distinction is that ______ .

A:grade is a category assigned to products or services having the same functional use. but different technical characteristics B:low quality may not be a problem; low grade is always a problem C:determining and delivering the required levels of quality are not included in the responsibilities of the project manager and the project team D:determining and delivering the required levels of grade are not included in the responsibilities of die project manager and the project team

Quality and grade are not the same. A fundamental distinction is that ______ .

A:grade is a category assigned to products or services having the same functional us but different technical characteristics B:low quality may not be a problem; low grade is always a problem C:determining and delivering the required levels of quality are not included in the responsibilities of the project manager and the project team D:determining and delivering the required levels of grade are not included in the responsibilities of die project manager and the project team

设有一成绩关系SC(Sno，Cno，Grade)，其中的属性分别表示学号、课程号、成绩。为了查询课程髓的最高分和最低分之差，可以使用语句： SELECT (24)
FROM SC
WHERE Gno=‘C1’

A:MAX-MIN(Grade) B:(Grade)MAX-MIN C:MAX(Grade)-MIN(Grade) D:MAX-MIN

在Visual FoxPro中，打开一个名为GRADE的数据库，应使用命令

A:CREATE DATABASE GRADE B:OPEN DATABASE GRADE C:CREATE GRADE D:OPEN GRADE

设有关系模式sc(sno，cno，grade)，各属性含义依次为学号、课程号、分数。SQL语句“SELECT sno.AVO(grade) FROM sc子句”的功能是计算每个学生的平均分数。其中的子句应是______。

A:GROUP BY grade B:GROUP BY sno C:ORDER BY grade D:ORDER BY sno

在Visual FoxPro中，打开一个名为GRADE的数据库，应使用命令

A:CREATE DATABASE GRADE B:OPEN DATABASE GRADE C:CREATE GRADE D:OPEN GRADE

设有关系模式sc (sno，cno，grade)，各属性含义依次为学号、课程号、分数。SQL 语句“SELECT sno，AVG(grade)FROM sc子句”的功能是计算每个学生的平均分数，其中的子句应是（）

A:GROUP BY grade B:GROUP BY sno C:ORDER BY grade D:ORDER BY sno